Heart

Question 1

Function of the heart

Answer 1

To pump blood around the body

Question 2

Through which side of the heart does oxygenated blood enter? what is its color? Where does it go?

Answer 2

Left side, bright red, rest of the body

Question 3

Through which side of the heart does deoxygenated blood enter? what is its color? Where does it go?

Answer 3

Right side, bluish red, lungs

Question 4

What type of circulatory system do we have?

Answer 4

Double circulatory system because the blood travels twice through the heart on one complete journey around the body

Question 5

What type of muscle is the heart made of? Why’s it special?

Answer 5

Cardiac muscle, it doesn’t get tired

Question 6

Size, weight and capacity of an average adult man’s heart

Answer 6

clenched fist, 300g, 250cm3

Question 7

How many times a minute does the heart beat?

Answer 7

70 times a minute

Question 8

What supplies the cardiac muscle with O2 and nutrients

Answer 8

Coronary arteries

Question 9

What removes the cardiac muscle’s waste products?

Answer 9

Coronary veins

Question 10

What makes the heart beat?

Answer 10

Tiny pulses of electricity which are sent out from the sinoatrial node (SA node) or pacemaker

Question 11

What senses CO2 levels?

Answer 11

The medulla, if CO2 levels increase then the brain sends nerve impulses to the pacemaker to make the heart beat faster

Question 12

What do you see when a heart is cut open?

Answer 12

You will find that it is hollow with 4 separate chambers

Question 13

What are the chambers in the heart called?

Answer 13

2 upper chambers-atria, 2 lower chamber-ventricles

Question 14

What separates the left and right sides of the heart

Answer 14

A septum

Question 15

What happens during cardiac diastole?

Answer 15

-Whole heart relaxes
-Blood flows into the heart from the pulmonary vein and vena cava
-Bicuspid and tricuspid valves open
-Pulmonary and aortic valves closed

Question 16

What happens during atrial systole, ventricular diastole?

Answer 16

-Valves in vena cava and pulmonary vein are closed
-muscles of atria contract
-Bicuspid and tricuspid valves open
-Blood forced from atria to ventricles
-Pulmonary and aortic valves closed
-Aorta recoils

Question 17

What happens during atrial diastole, ventricular systole?

Answer 17

-muscles of atria relax
-Bicuspid and tricuspid valves closed
-muscles of ventricles contract
-Pulmonary and aortic valves open
-Blood forced out of ventricles into arteries
-Aorta wall expands with blood

Question 18

Job of atria

Answer 18

Receive blood from lungs or body and supply to nearby ventricles

Question 19

Job of ventricles

Answer 19

Pump blood out of heart

Question 20

What has thicker walls?

Answer 20

The ventricles because they have to pump blood out of the heart

Question 21

Which ventricle has a thicker wall?

Answer 21

The left because it pumps blood to the rest of the body and the right pumps to the lungs which are close by

Question 22

What is the pulse?

Answer 22

The stretching and recoiling of the artery wall causing a ripple effect in the blood

Question 23

How many flaps are the bicuspid and tricuspid valves

Answer 23

2, 3

Question 24

Function of heart tendons

Answer 24

To maintain the valves closed when the ventricles contract and make sure that the valves do not open backwards inside out

Question 25

Definition of heartbeat

Answer 25

One complete contraction and relaxation of the heart

Question 26

Resting heartbeat

Answer 26

70 beats per minute

Question 27

Heartbeat during exercise

Answer 27

As fast as 150 beats per minute