the heart

Question 1

what is the function of the heart in the circulatory system?

Answer 1

the heart pumps blood through two circuits: to the lungs and to the rest of the body

⋆. 𐙚 ˚ humans have a double circulatory system.

Question 2

what are the two circuits of blood flow in the heart?

Answer 2

⋆. 𐙚 ˚ right side pumps blood to the lungs
⋆. 𐙚 ˚ left side pumps blood to the rest of the body

Question 3

what is the pathway of blood through the heart starting from the vena cava?

Answer 3

blood enters through the vena cava, into the right atrium, then right ventricle, through the pulmonary artery to the lungs, into the left atrium, then left ventricle, and finally through the aorta

⋆. 𐙚 ˚ this sequence describes the flow of blood through the heart

Question 4

why is the muscle wall on the left side of the heart thicker than the right side?

Answer 4

⋆. 𐙚 ˚ the left side needs to put the blood under higher pressure to pump it a greater distance around the body

Question 5

what is the purpose of the valves between the chambers of the heart?

Answer 5

to prevent blood flowing backwards, ensuring blood flows in one direction around the circulatory system

Question 6

fill in the blank: blood enters the heart through the _______

Answer 6

vena cava

Question 7

true or false: the right ventricle pumps blood to the rest of the body

Answer 7

false

Question 8

fill in the blank: blood is carried to the lungs through the _______

Answer 8

pulmonary artery