Question

question 4
vo₂max:
has a central component: a - v o₂ difference
represents maximal aerobic power
has a peripheral component: cardiac output
all of the above
question 5
the conduction zone is commonly called the respiration tree because of its appearance.
true
false
question 6
an electrical charge called an causes the muscle walls of the heart to contract.

Explanation:

• For Question 4: VO₂max represents maximal aerobic power. Its central component is a - v O₂ difference and peripheral component is cardiac output. So all options are correct.
• For Question 5: The conduction zone of the respiratory system has a branching - like structure similar to a tree, so it is commonly called the respiration tree. The statement is True.

Answer:

Question 4: D. all of the above
Question 5: True