The Function of a Third, Obliquely-Oriented Layer of Smooth Muscle

question 16

Multiple Choice

The function of a third, obliquely-oriented layer of smooth muscle in the muscularis externa of the stomach is to .

• A) carry waves of contraction around the stomach
• B) churn, mix, and pummel the food contents to reduce them to small fragments
• C) squeeze the stomach to reduce its size after a meal has emptied from it
• D) allow stronger contractions than those occurring in other parts of the alimentary canal

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Definitions:

Sensory Neurons

Nerve cells that are responsible for converting external stimuli from the environment into internal electrical impulses.

Stem Cells

Undifferentiated cells with the potential to develop into many different cell types that can contribute to repairing and replenishing tissues.

Motor Neurons

Motor neurons are nerve cells responsible for conveying signals from the brain and spinal cord to muscles, initiating movement.

Adrenal Glands

A pair of endocrine glands that sit just above the kidneys and secrete hormones (epinephrine and norepinephrine) that help arouse the body in times of stress.