1.1 Neural Control Mechanisms In Cardiovascular System

Question 1

What are neural control mechanisms

Answer 1

The 3 main mechanisms that control the rate at which cardiac impulses are fired

Question 2

What systems does the neural control mechanism involve

Answer 2

Sympathetic nervous system - stimulates heart to beat faster
Parasympathetic nervous system - returns heart to resting level

Question 3

What is the nervous system made up of

Answer 3

CNS - brain and spinal cord

Peripheral nervous system - nerve cells that transmit info to and from cns

Question 4

What are the CNS and peripheral nervous system coordinated by

Answer 4

Cardiac control centre in the medulla oblongata of the brain
This is stimulated by chemoreceptors baroreceptors and proprioceptors

Question 5

What are chemoreceptors

Answer 5

Tiny structures in the carotid arteries and aortic arch that detect changes in blood acidity caused by the increase or decrease in the concentration of co2 during exercise
Sense chemical changes

Question 6

What are baroreceptors

Answer 6

Nerve endings that respond to the stretching of the arterial wall caused by changes in blood pressure
They establish a set point for blood pressure

Question 7

What do baroreceptors do at the start of exercise

Answer 7

They make the set point increase so the heart rate doesn’t slow down because this would negatively affect performance

Question 8

What are properiorecptors

Answer 8

Sensory nerve endings located in muscles tendons and joints that provide Information about movement and body position
Detect an increase in muscle movement