Exam 4 Review

Recruitment is dictated by the size principle. Which fibers would be recruited for the most powerful contractions; which for light contractions?

• Small fibers; large fibers

• Medium fibers; small fibers

• Large fibers; small fibers

• Small fibers; medium fibers

In an isotonic contraction, muscle _____, whereas in isometric contraction the muscle ____

• Does not shorten; does not shorten

• Does not shorten; shortens

• Shortens; shortens

• Shortens; does not shorten

A sprinter is likely to depend on _____ respiration to generate ATP

• Aerobic

• Anaerobic

Tags

NGSS.HS-LS2-3

A motor unit is made of

• Nerves

• Bones

• Muscle fibers

• Glands

Why are calcium ions necessary for skeletal muscle contraction?

• Calcium increases the action potential transmitted along the sarcolemma

• Calcium releases the inhibition on Z disks

• Calcium triggers the binding of myosin to actin and starts the chain reaction after a nerve impulse

• Calcium causes the ATP binding to actin

A person is doing bicep curls. When they lift the weight up toward their body in the process of a curl, what kind of muscle contraction is occurring?

• Concentric contraction

• Eccentric contraction

Muscles become stiff after death due to a lack of ATP in a condition called

• Muscle fatigue

• Oxygen debt

• Muscle cramp

• Rigor mortis

What is the central nervous system made of?

• Brain and cranial nerves

• Spinal cord and spinal nerves

• Spinal nerves and cranial nerves

• Brain and spinal cord

There are 3 types of neurons: sensory, motor, and interneurons

• True

• False

Part of a neuron that receives information from other neurons

• Axon

• Myelin sheath

• Dendrites

• Synapse