Start Quiz: Anatomy & Physiology: Muscle Tissue MCQ Quiz

Question: According to the sliding filament model, binding sites on actin open when ________.

Choices:

creatine phosphate levels rise

ATP levels rise

acetylcholine levels rise

calcium ion levels rise

Question: The correct order for the smallest to the largest unit of organization in muscle tissue is ________.

Choices:

fascicle, filament, muscle fiber, myofibril

filament, myofibril, muscle fiber, fascicle

muscle fiber, fascicle, filament, myofibril

myofibril, muscle fiber, filament, fascicle

Question: Muscle relaxation occurs when ________.

Choices:

calcium ions are actively transported out of the sarcoplasmic reticulum

calcium ions diffuse out of the sarcoplasmic reticulum

calcium ions are actively transported into the sarcoplasmic reticulum

calcium ions diffuse into the sarcoplasmic reticulum

Question: The cell membrane of a muscle fiber is called ________.

Choices:

myofibril

sarcolemma

sarcoplasm

myofilament

Question: Muscle that has a striped appearance is described as being ________.

Choices:

elastic

nonstriated

excitable

striated

Question: In relaxed muscle, the myosin-binding site on actin is blocked by ________.

Choices:

titin

troponin

myoglobin

tropomyosin

Question: Which element is important in directly triggering contraction?

Choices:

sodium (Na+)

calcium (Ca++)

potassium (K+)

chloride (Cl-)

Question: Depolarization of the sarcolemma means ________.

Choices:

the inside of the membrane has become less negative as sodium ions accumulate

the outside of the membrane has become less negative as sodium ions accumulate

the inside of the membrane has become more negative as sodium ions accumulate

the sarcolemma has completely lost any electrical charge

Question: Which of the following properties is not common to all three muscle tissues?

Choices:

excitability

the need for ATP

at rest, uses shielding proteins to cover actinbinding sites

elasticity

Question: Thin and thick filaments are organized into functional units called ________.

Choices:

myofibrils

myofilaments

T-tubules

sarcomeres

Question: During muscle contraction, the cross-bridge detaches when ________.

Choices:

the myosin head binds to an ADP molecule

the myosin head binds to an ATP molecule

calcium ions bind to troponin

calcium ions bind to actin