Which of the following is made up of smooth muscle tissue?
Heart
Rectus abdominis
Esophagus
Pectoralis major
The Correct Answer is C
A. The heart is composed of cardiac muscle tissue, not smooth muscle. Cardiac muscle is specialized for rhythmic contractions to pump blood.
B. The rectus abdominis is composed of skeletal muscle tissue, which is voluntary and allows for movement of the trunk.
C. The esophagus contains smooth muscle tissue in its walls, which is responsible for the involuntary contractions (peristalsis) that move food from the mouth to the stomach.
D. The pectoralis major is composed of skeletal muscle tissue, which allows for voluntary control of arm movements.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Immunoglobulin G (IgG) is the most abundant antibody in the blood and plays a key role in the body's defense against bacterial and viral infections, but it is not directly involved in allergic reactions.
B. Immunoglobulin M (IgM) is the first antibody produced during an initial immune response, primarily involved in fighting infections, but it does not play a major role in allergic reactions.
C. Immunoglobulin E (IgE) is the antibody most directly involved in allergic reactions. When IgE binds to allergens, it triggers the release of histamine from mast cells, leading to the symptoms of allergies.
D. Immunoglobulin A (IgA) is primarily found in mucosal areas such as the respiratory and gastrointestinal tracts, where it helps prevent infections, but it is not directly involved in allergic responses.
Correct Answer is D
Explanation
A. The production of breast milk is the function of the mammary glands, not the lacrimal gland.
B. The production of saliva is the function of the salivary glands, not the lacrimal gland.
C. The secretion of cerumen (earwax) is the function of the ceruminous glands, not the lacrimal gland.
D. The lacrimal glands are responsible for the secretion of tears, which help to lubricate and protect the surface of the eyes. This is the correct answer.
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