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At rest, muscles obtain most of their energy by metabolizing:

A.

lactic acid

B.

glucose

C.

creatine phosphate

D.

Fatty acids

Answer and Explanation

The Correct Answer is D

Rationale:
A. Lactic acid is a byproduct of anaerobic metabolism when oxygen is limited, such as during intense exercise. Muscles do not metabolize lactic acid for energy at rest.
B. Glucose is a primary fuel source during moderate to high activity, but at rest, muscles rely more on fat metabolism.
C. Creatine phosphate provides a rapid, short-term energy source during the first few seconds of intense activity, but it is not the main energy source at rest.
D. At rest, skeletal muscles primarily metabolize fatty acids through aerobic respiration to produce ATP. This is because fat provides a more efficient and long-lasting energy source during periods of low demand.


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Related Questions

Correct Answer is A

Explanation

Rationale:
A. The adult human skeleton typically consists of 206 bones, including the axial and appendicular skeletons. This total provides structural support, protection for vital organs, and facilitates movement.
B. 110 is too low and does not account for all bones in the adult skeleton.
C. 126 represents approximately the number of bones in the appendicular skeleton alone, not the entire body.
D. 80 corresponds roughly to the number of bones in the axial skeleton only, not the full adult skeleton.

Correct Answer is C

Explanation

Rationale:
A. Hinge joints, like the elbow and knee, allow movement in only one plane (flexion and extension) and therefore have a limited range of motion.
B. Condyloid joints, such as the wrist, permit movement in two planes (flexion/extension and abduction/adduction) but do not allow full rotation.
C. Ball-and-socket joints, including the shoulder and hip, consist of a spherical head fitting into a cup-like cavity, allowing movement in multiple planes—flexion, extension, abduction, adduction, rotation, and circumduction—providing the greatest range of motion of all joint types.
D. Saddle joints, like the thumb carpometacarpal joint, allow movement in two planes with some rotation but still offer less overall mobility than ball-and-socket joints.

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