Mammilian heart

Question 1

Type of circulation

Answer 1

Double circulation

Question 2

Atria of heart

Answer 2

Have relatively thin walls and serve as collection chambers for blood returning to the heart (from lungs and tissues)

Question 3

Ventricles of heart

Answer 3

Have thicker walls and contract much more forcefully

Question 4

Cardiac cycle

Answer 4

Heart contracts and relaxes in a rhythmic cycle

systole, diastole, cardiac output, heart rate, stroke volume

Question 5

Systole

Answer 5

The contraction, or pumping phase

Question 6

Diastole

Answer 6

The relaxation of filling phase

Question 7

Cardiac output

Answer 7

The volume of blood pumped into the systemic circulation per minute and depends on both the heart rate and stroke volume

Question 8

Heart rate

Answer 8

(also called pulse) is the number of beats per minute

Question 9

Stroke volume

Answer 9

The amount of blood pumped in a single contraction

Question 10

How to calculate cardiac volume

Answer 10

Heart rate x stroke volume

Question 11

How many valves in the heart and what do they do

Answer 11

4. Prevent back flow

Question 12

AV valves

Answer 12

Atrioventricular valves, separate each atrium and ventricle (bicuspid and tricuspid)

Question 13

Semilunar valves

Answer 13

Control blood flow to the aorta and pulmonary artery

Question 14

What is the lub dub sound caused by

Answer 14

Recoil of blood against the semilunar valves

Question 15

Sinoatrial node (SA node)

Answer 15

Pacemaker, sets the rate and timing at which cardiac muscle cells contract

Question 16

Impulses from the SA node travel to _____

Answer 16

AV node

Question 17

Where do impulses go from AV node

Answer 17

The impulses are delayed and then travel to the purkinje fibers that make the ventricles contract

Question 18

How are impulses that travel through the cardiac cycle recorded

Answer 18

EKG

Question 19

What is the pacemaker regulated by

Answer 19

Sympathetic and parasympathetic nervous system

Question 20

What does the sympathetic division do for the pacemaker

Answer 20

Speeds it up

Question 21

What does the parasympathetic division do for the pacemaker

Answer 21

Slows it down

Question 22

What other things regulate the pacemaker

Answer 22

Hormones and temperature