Which of the following is not one of the major functions of muscles?
Movement
Protection
Heat production
Posture
The Correct Answer is B
A. Movement: This is a primary function; skeletal muscles move the skeleton, and smooth muscles move substances through organs.
B. Protection: While muscles provide some padding, protection is considered a primary function of the skeletal system (rib cage, skull) and integumentary system (skin).
C. Heat production: Muscles produce a significant amount of heat as a byproduct of contraction (thermogenesis), which is vital for maintaining body temperature.
D. Posture: Skeletal muscles maintain partial contraction (tonus) to keep the body upright and stable.
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Related Questions
Correct Answer is C
Explanation
A. medulla: The medulla oblongata controls autonomic functions like breathing and heart rate.
B. pons: The pons acts as a bridge for signals between different parts of the brain and helps regulate breathing.
C. cerebellum: The cerebellum is specifically responsible for coordinating muscle movement, posture, and maintaining balance.
D. hypothalamus: As noted previously, the hypothalamus focuses on homeostasis and hormone regulation, not physical balance.
Correct Answer is B
Explanation
A. break apart chunks of food: This describes segmentation, which is a mixing movement rather than a forward-moving wave.
B. propel food forward: Peristalsis is a wave-like contraction of smooth muscle that pushes the "bolus" or "chyme" forward through the digestive system.
C. absorb food: Absorption is the chemical/physical transport of nutrients into the blood, not the movement of the food mass itself.
D. enable swallowing: Swallowing (deglutition) involves peristalsis in the esophagus, but the purpose of peristalsis as a whole is movement throughout the entire tract.
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