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All of the following are benefits of aerobic training except

• The body makes more red blood cells to transport more oxygen to the muscles

• Arteries get stiff and rigid allowing for decreased blood flow

• More capillaries form in the muscle to more efficiently exchange O₂ and CO₂

• Muscles, including the heart, "hypertrophy" (get thicker) for more forceful contractions

It takes longer for your heart rate to return to normal after exercise as aerobic fitness improves.

• True

• False

The respiratory system includes the

• heart, arteries, veins and capillaries

• nose, mouth, lungs, diaphram

• heart, muscles, bones

• heart, lungs, blood vessels

In the lungs, oxygen (O₂) and carbon dioxide (CO₂) are exchanged through the process of diffusion in the small air sacs known as the

• bronchial's

• diaphragm

• capillaries

• alveoli

The process of breathing is known as

• inspiration

• exhalation

• respiration

• inhalation

What happens to your breathing rate when you exercise?

• It increases
• It decreases
• It stays the same

The type of muscle that contracts and relaxes without any conscious thought is

• a voluntary muscle

• an involuntary muscle

Which of the following are controlled by involuntary muscles? (Pick all that apply)

• The lungs

• The skeletal muscles (like the biceps)

• The heart

Glucose/Glycogen (the stored form of glucose) supplies continuous energy for aerobic activity for up to

• 30 seconds

• 2 minutes

• 60 minutes

• 2 hours

The energy compound that allows muscles to work is known as

• Actin

• ADP

• ATP

• Myosin