The Heart and Blood Vessels (control of heartbeat)

Question 1

What is heartbeat controlled by?

Answer 1

A pacemaker

Question 2

What does a pacemaker control?

Answer 2

Heartbeat is controlled by a pacemaker

Question 3

What is a pacemaker?

Answer 3

A small bundle of specialised tissue

Question 4

What is a small bundle of specialised tissue found in the heart which controls heartbeat called?

Answer 4

The pacemaker

Question 5

Where is the pacemaker located in the heart?

Answer 5

It is located in the wall at the top of the right atrium

Question 6

What is located in the wall at the top of the right atrium of the heart which controls heartbeat?

Answer 6

The pacemaker

Question 7

What does the pacemaker emit which initially cause the atria to contract?

Answer 7

Regular electrical impulses

Question 8

What is initially caused to contract by the regularly emitted electrical impulses of the pacemaker.

Answer 8

The atria

Question 9

What do the regularly emitted electrical impulses of the pacemaker initially cause to happen to the atria?

Answer 9

They cause them to initially contract

Question 10

What happens after the atria have contracted due to the electrical impulses of the pacemaker?

Answer 10

The blood is pumped from the atria to the ventricles and is then pumped from the ventricles out of the heart

Question 11

What can the frequency of the impulses of the pacemaker by increased or decreased by?

Answer 11

The brain

Question 12

What is the pacemaker also called?

Answer 12

The SA or sinoatrial node

Question 13

What is the SA or sinoatrial node commonly called?

Answer 13

The pacemaker

Question 14

How does the pacemaker control heartbeat?

Answer 14

The pacemaker pulses and causes the atria to contract

Question 15

What does the pacemaker’s electrical impulse stimulate?

Answer 15

The AV (atrioventricular) node

Question 16

What stimulates the AV node?

Answer 16

The electrical impulses of the pacemaker

Question 17

What is the full name of the AV node?

Answer 17

The atrioventricular node

Question 18

What is the full name for the SA node?

Answer 18

The sinoatrial node

Question 19

Where is the AV node located in the heart?

Answer 19

It is located further down from the SA node in the right ventricle near to where it joins the ventricle

Question 20

What does the AV node send down special muscle fibre located in the septum?

Answer 20

Impulses

Question 21

What send impulses down special muscle fibres located in the septum?

Answer 21

The AV node

Question 22

Where does the AV node send impulses down?

Answer 22

Special muscle fibres located in the septum

Question 23

What passes the impulses of the AV node out to the walls of the ventricles?

Answer 23

Thin fibres

Question 24

What passes the impulses of the AV node out of by thin fibres?

Answer 24

Out to the walls of the ventricles

Question 25

What do the impulses from the AV node cause to happen to the ventricles?

Answer 25

They cause them to contract

Question 26

What do the impulses from the AV node cause to contract?

Answer 26

The ventricles

Question 27

Besides the pacemaker what can change the rate at which the pacemaker operates?

Answer 27

Nerves from the brain along with hormones

Question 28

What can the pacemaker and nerves from the brain along with hormones change the rate of?

Answer 28

The rate at which the pacemaker operate

Question 29

What factors increase the rate of heartbeat?

Answer 29

Exercise
Temperature
Emotions
Shock

Question 30

What factors decrease the rate of heartbeat?

Answer 30

Relaxation
Sleep
Alcohol