Module 28

Question 1

Chemoreceptors are responsible for……….

Answer 1

Sensing oxygen, carbon dioxide, and pH levels and send that information to the respiratory system.

Question 2

Physiology of exercise is centered on

Answer 2

Delivering oxygen & energy source (glucose/fat) to muscles.

Question 3

VO2 max

Answer 3

Maximum amount of oxygen you can use during the most intense excercise.

Question 4

%VO2 max

Answer 4

Measure of exercise intensity for the individual

Question 5

Where are the respiratory control centers?

Answer 5

Medulla oblongata and Pons which control the inspiratory and expiratory skeletal muscles.

Question 6

Why do you bring without thinking about it?

Answer 6

The respiratory control center always fires action potentials without a sensory input. Similarly they have peacemaking ability.

Question 7

More CO2 in the blood……

Answer 7

creates a slightly more acidic environment.

Question 8

Peripheral chemoreceptors

Answer 8

located in carotid artery, primarily sense pH (monitor H+ concentration), but can also sense CO2 and O2 concentrations.

Question 9

Central chemoreceptors

Answer 9

located in medulla oblongata, only sense pH.

Question 10

What happens during exercise?

Answer 10

Breathing rate increases
Breath becomes deeper

Question 11

What happens in the arterial blood?

Answer 11

The peripheral receptors detect PCO2 levels and pH levels and send signals to the respiratory center.

Question 12

What happens in the cerebral spinal fluid?

Answer 12

The central chemoreceptors can detect the change in pH levels and send signals to the respiratory center.

Question 13

What is the motor cortex responsible for during exercise?

Answer 13

1. Receives input from the proprioceptors and sends signals to motor neurons
2. Activates the cardiovascular control center in the medulla to increase sympathetic activity

Question 14

What happens when the sympathetic system is activated?

Answer 14

Heart rate and ventricle contractility increases