AP TEST (Muscle)

Which of the following is NOT one of the primary functions of the muscular system?

• Movement

• Posture maintenance

• Heat production

• Digestion

Which of the following is a characteristic of smooth muscle?

• A) Striated appearance and voluntary control

• B) Non-striated appearance and involuntary control
  

• C) Striated appearance and involuntary control

• D) Non-striated appearance and voluntary control

Which muscle type has intercalated discs?

• Skeletal Muscle

• Cardiac Muscle

• Smooth Muscle

• Both Skeletal and Cardiac

Which of the following is a unique characteristic of skeletal muscle fibers compared to both cardiac and smooth muscle?

• Skeletal muscle fibers are involuntary and have a single nucleus

• Skeletal muscle fibers are multinucleated and striated

• Skeletal muscle fibers can contract without neural input

• Skeletal muscle fibers are striated and have a single nucleus

Which of the following statements about cardiac muscle is incorrect?

• Cardiac muscle fibers are branched and interconnected by intercalated discs.

• Cardiac muscle cells have a single, centrally located nucleus.

• Cardiac muscle can contract voluntarily when prompted by the nervous system

• Cardiac muscle is striated and involuntary in nature

Which of the following best describes the characteristic of contractility in muscle tissue?

• The ability of muscle tissue to respond to electrical stimuli

• The ability of muscle tissue to stretch without being damaged

• The ability of muscle tissue to return to its original length after being stretched

• The ability of muscle tissue to shorten and generate force

Which of the following terms refers to the ability of muscle tissue to return to its original shape after being stretched or contracted?

• Elasticity

• Extensibility

• Excitability

• Contractility

Which of the following describes the function of the sarcoplasmic reticulum (SR) in skeletal muscle fibers?

• To store and release calcium ions during muscle contraction

• To produce ATP during muscle contractions

• To store glycogen for energy

• To produce collagen fibers for muscle strength

The perimysium is a connective tissue structure that:

• Surrounds individual muscle fibers within a fascicle

• Surrounds entire muscles and is continuous with tendons

• Surrounds a group of muscle fibers (fascicle)

• Separates the actin and myosin filaments in the sarcomere

Which of the following best describes a muscle fascicle?

• A bundle of muscle fibers

• A single muscle cell

• The entire muscle organ

• A layer of connective tissue