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Circulation and Respiration

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Presentation on theme: "Circulation and Respiration"— Presentation transcript:

1 Circulation and Respiration
Supplying Oxygen to the body through the bloodstream

2 Blood Vessels Blood vessels carry blood from your heart to all of your body parts, and then back again. Blood vessel walls consist of muscle tissue and connective tissue that enable it to expand and contract as blood flows through it. Red blood cells inside the vessel carry oxygen to all parts of your body.

3 Circulatory System Together, the organs of the circulatory system supply nutrients and oxygen to your body They remove waste products that would be harmful to your health if they were not removed

4 Heart The human heart is the primary organ of the circulatory system
It is a 4-chambered organ Blood is actually a type of connective tissue that circulates throughout the body carrying nutrients and oxygen

5 Blood Vessels Arteries – Blood vessels that carry blood away from the heart This blood can be going to the lungs Or to the body organs Veins – Carry blood to the heart From the lungs From the body organs Capillaries –Tiny blood vessels that allow for diffusion of oxygen and nutrients between the arteries and veins

6 Blood Vessels

7 Heart and Blood Flow pulmonary circuit carries oxygen-poor blood from the heart to the lungs and oxygen-rich blood back to the heart. In the lungs the blood picks up oxygen which is used by the body organs

8 Systemic Circuit The Systemic circuit takes the oxygen rich blood TO the body organs and returns the oxygen depleted blood back to the heart The blood is then brought back to the lungs (by the pulmonary system) to get oxygen

9 Structures of the Heart

10 High Oxygen Heart Structures
Aorta – Carries Blood to the rest of the body Left Atrium – Oxygen-rich blood enters the left atrium through the pulmonary veins Blood passes through the atrioventricular valves to the Left ventricle Left Ventricle- Made of thick cardiac muscle is the pump. This chamber pumps oxygen-rich blood to the body through the aorta

11 Low Oxygen Side of the Heart
Right Atrium – Oxygen-poor blood enters the right atrium from the body organs through the upper and lower vena cava (veins) Blood passes through the right atrioventricular valves to the right ventricle Right Ventricle –Blood is sent to the lungs through the pulmonary arteries pulmonary Arteries carry oxygen-poor blood back to the lungs

12 Blood Pressure Systolic pressure measures the pressure of the heart when it is pumping blood Diastolic pressure is the pressure of the heart “at rest” or taking in blood Normal blood pressure is below 130/85

13 Respiratory System The structures of the respiratory system include the mouth, nose, pharynx, larynx, trachea, and lungs As you inhale, air enters the respiratory system through the nose or mouth. Many of the impurities in air, such as dirt and bacteria, are filtered by hair and mucus in the nose. Next, air passes into the pharynx (the throat), where the passageways for air and food cross

14 Respiratory System Air next passes into the trachea or windpipe.
The trachea forks into two bronchial air tubes that connect the trachea to the lungs. You have two lungs that function in the exchange of oxygen and carbon dioxide with the blood

15 Diffusion in the lungs Alveoli in the bronchi are tiny sacs that allow oxygen to diffuse in and Carbon dioxide to diffuse out of the body

16 Gas Exchange Carbon Dioxide is more acidic than oxygen.
When we exercise, our body organs use oxygen and release CO2 The brain responds to the increase in acid by increasing the rate of breathing and heart – to pump CO2 out and get more oxygen in quickly


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