The Circulatory System
The Learning Objectives Define the parts of the circulatory system and what they do Point out the four chambers of the heart and what they do Compare arteries, capillaries, and veins
Before We Get Into The Heart of the Lesson
The Cold Heart Facts - The heart is a muscle - The heart is a little larger than your clenched fist - Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times. - Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard—twice as hard as the leg muscles of a person sprinting
- The heart pumps about 1 million barrels of blood during an average lifetime—that's enough to fill more than 3 super tankers
The bodily system consisting of the heart, blood vessels, and blood that circulates blood throughout the body, delivers nutrients and other essential materials to cells, and removes waste products -- Also called the cardiovascular system. The Definition
The Circulatory System What it consists of: What it does: - Heart - Blood Vessels - Blood - Circulates blood throughout the body - Delivers nutrients to cells - Removes waste products from cells
The Heart A hollow muscular organ that pumps the blood through the circulatory system by rhythmic contraction and dilation.
The Four Chambers Of The Heart
Left Atrium: Left Atrium: Takes oxygen-rich blood from the lungs and pumps it into the left ventricle Left Ventricle: Left Ventricle: Pumps the oxygen-rich blood through the aorta which sends it out into the body Right Atrium: Right Atrium: Takes the used blood from the body that no longer has oxygen and pumps it into the right ventricle Right Ventricle: Right Ventricle: Pumps the oxygen-less blood into the lungs where it picks up oxygen again
Blood Vessels - The part of the circulatory system that transports blood throughout the body.
Three Types of Blood Vessels 2) Veins: carry blood containing waste products to different organs (kidneys, liver, etc.) and then back to the heart 1) Arteries: carry oxygen-rich blood away from the heart 3) Capillaries: enable the actual exchange of water and chemicals between the blood and the tissues – for example…diffusion of oxygen within the lungs
The Four Chambers Of The Heart
The Aorta The largest artery in the body, originating from the left ventricle of the heart and extending down to the abdomen, where it branches off into two smaller arteries. The aorta distributes oxygenated blood to all parts of the body.
Blood The fluid that circulates in the heart, arteries, capillaries, and veins of a vertebrate animal carrying nourishment and oxygen to and bringing away waste products from all parts of the body.
The Bloody Truth Blood consists of: - Red blood cells: disk shaped cells that carry oxygen to cells and carbon dioxide out - White blood cells: cells that engulf and digest bacteria and fungi; an important part of the body's defense system - Plasma: straw-colored liquid component of blood. It is mostly water (93% by volume) and contains dissolved proteins, glucose, clotting factors, mineral ions, hormones and carbon dioxide
Homework Option 1) Write an essay that details a day in the life of a red blood cell as it travels through the circulatory system … where did you go and what happened Option 2) Draw the circulatory system and point out the three different types of blood vessels, the heart and its chambers, the lungs, and red blood cells.