circulatory system

Question 1

what is the main purpose of the circulatory system

Answer 1

The function of the circulatory system is to transport O2 and nutrients to body cells and to carry oxygen-poor blood and CO2 back to the heart and lungs.

Question 2

which organs are in the circulatory system

Answer 2

• blood vessels
• heart
• blood

Question 2

what is the function of blood vessels in the circulatory system

Answer 2

to deliver blood to the organs and tissues in your body.

Question 2

what is the function of the heart in the circulatory system

Answer 2

the heart sends blood throughout our bodies, carrying oxygen to every cell

Question 3

what is the function of blood in the circulatory system

Answer 3

blood carries carbon dioxide to the lungs (for exhalation) and picks up oxygen

Question 4

compare arteries, veins and capillaries.

Answer 4

Arteries carry blood away from your heart. Veins carry blood back toward your heart. Capillaries, the smallest blood vessels, connect arteries and veins. They all transport blood around the body.

Question 5

Describe how blood is moved through arteries, capillaries and veins

Answer 5

Blood flows in the same direction as the decreasing pressure gradient: arteries to capillaries to veins

Question 6

Explain how valves help blood flow in one direction in veins

Answer 6

One-way valves consist of two flaps (cusps or leaflets) with edges that meet. These valves help veins return blood to the heart. As blood moves toward the heart, it pushes the flaps open

Question 7

step 1 and 2 of blood flow through the heart

Answer 7

1. The blood first enters the right atrium from the superior and inferior vena cava.
2. It then flows through the tricuspid valve into the right ventricle

Question 8

step 3 and 4 of blood flow through the heart

Answer 8

3. The blood then moves through the pulmonary valve into the pulmonary artery.
4. The pulmonary artery carries blood to the lungs where it takes up oxygen.

Question 9

step 5 and 6 (left side) of blood flow through the heart

Answer 9

5. Oxygenated blood returns to the heart through the pulmonary vein into the left atrium.
6. The blood then moves through the mitral valve into the left ventricle.

Question 10

step 7 (left side) of blood flow through the heart

Answer 10

7. The left ventricle then pumps the blood through the aortic valve into the aorta.

Question 11

step 8 (left side) of blood flow through the heart

Answer 11

8. From the aorta, the blood is transported through the network of blood vessels, delivering oxygen and nutrients to tissues and taking carbon dioxide and wastes from tissues.

Question 12

step 9 (left side) of blood flow through the heart

Answer 12

Deoxygenated blood returns to the heart via the superior and inferior vena cava, and the cycle begins again.

Question 13

Explain how valves help blood flow in one direction

Answer 13

Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood

Question 14

Explain how nutrient and waste exchange in the capillaries occurs by
diffusion

Answer 14

oxygen and nutrients diffuse from the blood into the tissues, and waste products diffuse from the tissues into the blood