6.3 B: Contraction of a Skeletal Muscle as a Whole

Anaerobic glycolysis requires ________ to make ATP.

• creatine phosphate only

• oxygen only

• glucose only

• both oxygen and glucose

A smooth, sustained contraction, with no evidence of relaxation, is called ________.

• fused, or complete, tetanus

• a twitch

• unfused, or incomplete, tetanus

• summing of contractions

Contractions in which muscles shorten and produce movement are known as ________.

• isotonic contractions

• twitches

• isometric contractions

• resistance exercises

Skeletal muscle, as a whole, can generate different amounts of force, and different degrees of shortening, in response to stimuli. What is this concept called?

• graded response

• twitch

• fused, or complete, tetanus

• incomplete, or unfused, tetanus

• action potential

A skeletal muscle twitch differs from a tetanic contraction in that ________.

• the tetanic contraction is considered abnormal, while the twitch is a normal muscle response

• the tetanic contraction is caused by a single stimulus, while the twitch is caused by very rapid multiple stimuli

• the muscle twitch is prolonged and continuous while a tetanic contraction is brief and "jerky"

• the muscle twitch occurs only in small muscles while a tetanic contraction occurs in large muscle groups

• the muscle twitch is a brief and "jerky" movement, while the tetanic contraction is prolonged and continuous

Creatine phosphate (CP) functions within the muscle cells by ________.

• forming a temporary chemical compound with myosin

• forming a chemical compound with actin

• inducing a conformational change in the myofilaments

• storing energy that will be transferred to ADP to resynthesize ATP as needed

• storing energy that will be transferred to ATP to resynthesize ADP as needed

The condition of skeletal muscle fatigue can be best explained by ________.

• the all-or-none law

• the inability to generate sufficient quantities of ATP due to feedback regulation of synthesis

• the inability of the muscle to contract even if it is being stimulated

• a total lack of ATP in the body

• inadequate numbers of mitochondria in muscle cells

Which of the following is an example of an isometric contraction?

• shaking the head as to say "no"

• pushing against an immovable wall

• bending the elbow

• rotating the arm

• nodding the head as to say "yes"

Which method of regenerating ATP during muscle contraction can produce lactic acid?

• aerobic cellular respiration

• oxidative phosphorylation

• direct phosphorylation

• creatine phosphate

• anaerobic glycolysis

Which of the following is a type isometric exercise in which muscles increase in size and strength?

• swimming

• biking

• jogging

• lifting weights

• dancing