Chapter 9-10 Practice Exam

What muscle tissue contains intercalated discs but is involuntary?

• skeletal, smooth and cardiac muscle

• skeletal muscle

• cardiac muscle

• smooth muscle

The time that elapses between the stimulation of a muscle and the contraction of that muscle is defined as the_

• Latent period

• Refractory period

• Recruitment period

• Depolarization period

This is an increase in the number of motor units.

• synergist

• threshold stimulus

• activation energy

• recruitment

Which is a fine or wispy sheath of connective tissue that surrounds each individual muscle fiber and consists of fine areolar connective tissue?

• Epimysium

• Perimysium

• Endomysium

• Sarcoplasm

Which type of muscle contraction occurs when the muscle neither shortens nor lengthens during contraction?

• Concentric

• Isotonic

• Isometric

• Eccentric

A partial but sustained contraction

• twitch

• muscle tone

• cramp

• atrophy

Where are vesicles with neurotransmitters stored?

• motor end plate

• mitochondria

• axon

• motor neuron endings

An action potential travels across the sarcolemma and into the muscle fiber (cell) by means of

• endoplasmic reticulum

• transverse tubules (t tubules)

• mitochondria

• motor end plate

In the sliding filament Model of Contraction at microscopic level 4 things happen to the sarcomere. Which of the following is true?

• I-bands shorten

• The h-zone appears

• The distance between z-disc elongate or are pulled further the M-line

The amount of oxygen needed to convert lactic acid to glucose is

• acidosis

• oxygen debt

• anaerobic respiration

• aerobic respiration