Muscle Physiology and Anatomy Quiz

During which phase of the crossbridge cycle is ATP split into ADP and ?

• Immediately preceding the detachment of the myosin head.

• Immediately preceding the resetting of the myosin head.

• Immediately preceding the power stroke.

For relaxation to occur,

• ACh receptors close and Ca++ channels on the sarcoplasmic reticulum close.

• ACh receptors close and Ca++ channels on the sarcoplasmic reticulum open.

• ACh receptors open and Ca++ channels on the sarcoplasmic reticulum close.

• ACh receptors open and Ca++ channels on the sarcoplasmic reticulum open.

When a muscle relaxes,

• crossbridges form and muscle extensibility returns the muscle to rest length.

• crossbridges form and muscle elasticity returns the muscle to rest length.

• crossbridges stop forming and muscle elasticity returns the muscle to rest length.

• crossbridges stop forming and muscle extensibility returns the muscle to rest length.

Glycolysis is an

• aerobic process that occurs in the cytosol.

• aerobic process that occurs in the mitochondria.

• anaerobic process that occurs in the cytosol.

• anaerobic process that occurs in the mitochondria.

The net energy yield from one glucose molecule through the process of glycolysis is

• 2 ATP.

• 6 ATP.

• 30 ATP.

• 36 ATP.

For a sprint lasting 60 seconds, ATP is supplied primarily by

• aerobic respiration only.

• phosphate transfer and glycolysis.

• conversion of lactate to pyruvate.

• phosphate transfer only.

In a lab, wave summation is demonstrated by increasing the_________ of the stimulus.

• intensity

• frequency

• capacitance

• warm up time

Which contraction occurs when you try (unsuccessfully) to move a wall?

• Isometric

• Isotonic

When a muscle is isometrically contracted, its length_________ change.

• does

• does not

The top long-distance runners probably have _________ proportion of slow muscle fibers in their leg muscles.

• a higher

• a lower

• the same