Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu To View the presentation as a slideshow with effects select “View”

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Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Circulatory and Respiratory Systems Chapter 38 Table of Contents Section 1 The Circulatory System Section 2 The Heart Section 3 The Respiratory System

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Objectives List five types of molecules that are transported by the cardiovascular system. Differentiate between arteries, capillaries, and veins. Relate the function of the lymphatic system to the functions of the cardiovascular and immune systems. Relate each component of blood to its function. Summarize how a person’s blood type is determined. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Transport and Distribution The human cardiovascular system functions like a network of highways. The circulatory system, which includes the cardiovascular and lymphatic systems, transports nutrients, hormones, and metabolic wastes to different parts of the body. The respiratory system takes in oxygen, O 2, and releases carbon dioxide, CO 2. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Blood Vessels Blood circulates through the body through a network of vessels. Arteries are blood vessels that carry blood away from the heart. Veins are blood vessels that carry the blood back to the heart. Capillaries are tiny blood vessels that allow the exchange of gases, nutrients, hormones, and other molecules in the blood. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Blood Vessels, continued Arteries Arteries have thick, elastic walls that can withstand the heart’s forceful pumping of blood. An artery’s wall expands when blood in pumped into it and then returns to its original size. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Blood Vessels, continued Capillaries No cell in the human body is more than a few cell diameters away from a capillary. Capillary walls are only one cell thick. Gas and nutrient molecules pass easily through their thin walls. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Blood Vessels, continued Veins The walls of veins are much thinner than the walls of arteries. Veins are farther from the heart and exposed to lower pressures. Veins are larger in diameter than arteries. Most veins have one-way valves. A valve is a flap of tissue that ensures that blood that passes through does not flow backwards. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Blood Vessels, continued Lymphatic System The lymphatic system collects and recycles fluids leaked from the cardiovascular system. It is involved in fighting infections. The lymphatic system is made up of a network of vessels called lymphatic vessels and tiny bean- shaped structures called lymph nodes. Lymph nodes may become swollen when they are fighting infection. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Components of Blood Blood contains water, a variety of molecules dissolved or suspended in the water, and three kinds of cells. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Components of Blood, continued Plasma Plasma is the liquid portion of blood. It contains water and solutes, including metabolites and wastes, salts, and proteins. Some plasma proteins enable blood clots to form. Other plasma proteins are antibodies that help the body fight disease. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Components of Blood, continued Blood Cells and Cell Fragments Red blood cells carry oxygen. Anemia is a condition in which the oxygen-carrying capacity of the blood is reduced. White blood cells defend the body against disease. Platelets are cell fragments that play an important role in blood clotting. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Components of Blood, continued Blood Type The ABO blood group system is used to determine blood type. Under this system, the primary blood types are A, B, AB, and O. The letters A and B refer to antigens on the surface of red blood cells. Blood transfusion recipients must receive blood that is compatible with their own blood type. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Components of Blood, continued Rh Factor Rh factor is another important antigen on the surface of red blood cells. Persons who have this protein are Rh +. Persons who lack it are Rh -. Section 1 The Circulatory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 2 The Heart Objectives Differentiate the pulmonary circulation loop from the systemic circulation loop. Summarize the path that blood follows through the heart. Name the cluster of heart cells that initiates contraction of the heart. Describe three ways to monitor the health of the circulatory system. Name two vascular diseases, and identify factors that contribute to their development. Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu A Muscular Pump The pumping action of the heart provides enough pressure to move blood throughout the body. The heart is made up mostly of cardiac muscle tissue, which contracts to pump blood. Section 2 The Heart Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu A Muscular Pump, continued Two Separate Circulatory Loops The right side of the heart drives the pulmonary circulation loop, which pumps oxygen-poor blood to the lungs. The left side of the heart drives the systemic circulation loop, which pumps oxygen-rich blood to the tissues of the body. Section 2 The Heart Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Circulation of Blood The left and right atria are chambers that receive blood returning to the heart. Below the atria are the left and right ventricles, thick-walled chambers that pump blood away from the heart. The inferior vena cava and superior vena cava deliver blood directly into the right atrium of the heart. The aorta is a large artery that carries blood away from the heart. The coronary arteries supply the heart with oxygen-rich blood. Section 2 The Heart Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Circulation of Blood, continued Initiating Contraction Contraction of the heart is initiated by a small cluster of cardiac muscle cells called the sinoatrial node. The sinoatrial node is embedded in the upper wall of the right atrium. The SA node is influenced by many factors, including hormones, temperature, and exercise. Section 2 The Heart Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Circulation of Blood, continued Monitoring the Cardiovascular System Blood pressure is the force exerted by blood as it moves through blood vessels. The pulse is a series of pressure waves within an artery caused by the contractions of the left ventricle. A heart attack occurs when an area of the heart muscle stops working and dies. When an area of the brain dies the result is a stroke. Section 2 The Heart Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Section 3 The Respiratory System Objectives Summarize the path that air follows when it enters the body through the nose or mouth. Describe the role of the rib muscles and diaphragm in breathing. Describe how breathing rate is regulated. Summarize how oxygen and carbon dioxide are transported in the blood. Identify three serious diseases of the lungs. Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Gas Exchange During aerobic respiration, cells must take in oxygen to oxidize glucose and make ATP. Cells must also release carbon dioxide, a waste product of aerobic respiration. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Gas Exchange, continued The Path of Air From the nose, air passes through a muscular tube in the upper throat called the pharynx. The air flows through a passageway for air called the larynx. Air then passes into the trachea. The trachea divides into two smaller tubes, the bronchi, which lead to the lungs. Within the lungs, gas exchange occurs in clusters of tiny sacs called alveoli. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Gas Exchange, continued Lungs The lungs are suspended in the chest cavity, bounded on the sides by the ribs and on the bottom by the diaphragm. The diaphragm is a muscle spanning the rib cage under the lungs. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Breathing Air is drawn into and pushed out of the lungs by the mechanical process known as breathing. When the diaphragm contracts, it moves down and air rushes into the lungs. When the diaphragm relaxes, it moves up and air is forced out. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Breathing, continued Breathing Rate Receptors in the brain and cardiovascular system continually monitor the levels of oxygen and carbon dioxide in the blood. The receptors send nerve signals to the brain. The brain responds by sending signals to the diaphragm to speed or slow the rate of breathing. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Gas Transport After oxygen molecules enter the alveoli, they are picked up by red blood cells containing hemoglobin. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Gas Transport, continued Oxygen Transport In the lungs, hemoglobin molecules in the blood pick up oxygen. The blood travels to the heart, then to the rest of the body. In body tissues, oxygen diffuses into the cells for use during aerobic respiration. Carbon dioxide diffuses from the cells into the blood. In the lungs, carbon dioxide is released. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Gas Transport, continued Carbon Dioxide Transport Carbon dioxide, CO 2, is carried by the blood in three forms: dissolved in blood plasma, attached to hemoglobin molecules, or as bicarbonate ions. The CO 2 ultimately diffuses out of the capillaries into the alveoli and is exhaled into the atmosphere. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Respiratory Diseases Respiratory diseases affect millions of Americans. A chronic pulmonary—or lung—disease is one for which there is no cure. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Respiratory Diseases, continued Asthma Asthma is a chronic condition in which the bronchioles of the lungs become inflamed, resulting in a narrowing of the airways. Prescribed inhalant medicines can help to stop an asthma attack by expanding the bronchioles. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Respiratory Diseases, continued Emphysema Emphysema is a chronic pulmonary disease resulting from a chemical imbalance that destroys elastic fibers in the lungs. Emphysema damages or destroys the alveoli, causing constant fatigue and breathlessness. Smoking causes up to 90 percent of emphysema cases. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Respiratory Diseases, continued Lung Cancer Lung cancer is a disease characterized by abnormal cell growth. Smoking is the major cause of lung cancer. Section 3 The Respiratory System Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Multiple Choice Use the chart below and your knowledge of science to answer questions 1–3. Standardized Test Prep Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Multiple Choice, continued 1.A person who consumes 23 g of salt per day is likely to have a systolic pressure of about A.120 mm Hg. B.130 mm Hg. C.140 mm Hg. D.150 mm Hg. Standardized Test Prep Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Multiple Choice, continued 2.People with a normal systolic pressure likely have a daily salt intake that does not exceed F.4 g. G.16 g. H.19 g. J.27 g. Standardized Test Prep Chapter 38

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Multiple Choice, continued 3.What conclusion can be drawn from the chart? A.Increasing one’s salt intake leads to an increased systolic pressure. B.Raising one’s systolic pressure leads to a greater appetite for salt. C.A person can control hypertension by consuming more salt. D.A daily salt intake of 10 g or less is associated with a risk to health. Standardized Test Prep Chapter 38

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