Heart Rate Regulation

Question 1

What is the CCC responsible for?

Answer 1

The cardiac control center receives information from the sensory nerves and send direction through the motor nerves to change heart rate

Question 2

What are the 3 main sources of information that go to the CCC?

Answer 2

1. Neural control
2. Intrinsic control
3. Hormonal control

Question 3

What does Neural control carry?

Answer 3

It carries information from three receptors:

1. Chemo-receptors
2. Proprio-receptors
3. Baro-receptors

Question 4

What do Chemo-receptors detect?

Answer 4

Chemo-receptors detect chemical changes in the bloodstream (oxygen and carbon dioxide)

Question 5

What do Proprio-receptors detect?

Answer 5

Proprio-receptors detect movement of limbs

Question 6

What do Baro-receptors detect?

Answer 6

Baro-receptors detect changes in blood pressure

Question 7

What does the Intrinsic control carry?

Answer 7

It carries information from:

1. Thermo-receptors
2. Venous Return

Question 8

What do Thermo-receptors detect?

Answer 8

Thermo-recpetors detect changes in temperature of the blood. The warmer the blood, the more viscous it is and therefore the slower the speed of nerve impulse (heart rate) transmission.

Question 9

What is Venous Return?

Answer 9

Venous return is the amount of blood going back to the heart. An increased venous return stretches the right atria causing the SA node to fire faster and then the right ventricle stretches further and because it is elastic it contracts with more force. Therefore the SV increases and so does the Q.

Question 10

What does the Hormonal control carry?

Answer 10

The Hormonal control carries information from:

1. Adrenaline
2. Nor-adrenaline

Question 11

What does adrenaline and nor-adrenaline do?

Answer 11

Adrenaline is released from the adrenal glands and increases the force of ventricular contraction (therefore SV) and increases the speed of electrical activity through the heart (therefore HR)

Question 12

After information is sent to the CCC, where does it go?

Answer 12

Information is wither sent to the sympathetic nervous system (increases heart rate) or to the parasympathetic nervous system (decreases heart rate)

Question 13

What is the sympathetic nervous system otherwise known as?

Answer 13

The accelerator nerve

Question 14

What is the parasympathetic nervous system otherwise known as?

Answer 14

The vagus nerve