Which of the following substances is necessary for the absorption of vitamin B12?
Intrinsic factor
Bile salts
Pepsin
Amylase
The Correct Answer is A
A. Intrinsic factor is a glycoprotein produced by the stomach that binds to vitamin B12 and facilitates its absorption in the small intestine, particularly in the ileum. This is the correct answer.
B. Bile salts are involved in the digestion and absorption of fats, not vitamin B12.
C. Pepsin is an enzyme in the stomach that aids in the digestion of proteins but is not involved in vitamin B12 absorption.
D. Amylase is an enzyme that helps break down carbohydrates, not involved in the absorption of vitamin B12.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
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.
Correct Answer is C
Explanation
A. Mast cells do not function to connect the skin to muscles. This is the role of connective tissues such as tendons.
B. Mast cells do not cushion bony prominences. Adipose tissue and connective tissue help to provide cushioning.
C. Mast cells are involved in the inflammatory response. They release histamine and leukotrienes, which play a significant role in initiating inflammation, especially during allergic reactions and immune responses. This is the correct answer.
D. While mast cells are involved in immune responses, their main role is not to directly destroy pathogens. Other cells like macrophages and neutrophils are responsible for pathogen destruction.
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