Which muscle type functions involuntarily and is found in the walls of internal organs?
Cardiac muscle
Smooth muscle
Striated muscle
Skeletal muscle
The Correct Answer is B
A. Cardiac muscle: Cardiac muscle is found only in the heart and contracts involuntarily to pump blood. While it shares some involuntary characteristics with smooth muscle, it is specialized for rhythmic contraction and is not present in the walls of other internal organs.
B. Smooth muscle: Smooth muscle is found in the walls of internal organs such as the stomach, intestines, and blood vessels. It functions involuntarily, controlling movements like peristalsis and vessel constriction without conscious effort, making it essential for organ function.
C. Striated muscle: Striated muscle refers to muscle with a striped appearance, including both skeletal and cardiac muscle. Striated muscle does not describe smooth muscle and is not primarily involved in involuntary movements of internal organs.
D. Skeletal muscle: Skeletal muscle is under voluntary control and is attached to bones to facilitate movement. It is not found in internal organs and does not function automatically, distinguishing it from smooth muscle.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Neutrophils: Neutrophils are the most abundant white blood cells and are first responders to bacterial infections. They phagocytize bacteria and release enzymes to destroy pathogens.
B. Basophils: Basophils release histamine and other mediators during allergic reactions and inflammation, but they do not play a primary role in directly fighting bacterial infections.
C. Lymphocytes: Lymphocytes, including B and T cells, are central to adaptive immunity, targeting specific pathogens, viruses, and infected cells rather than providing immediate defense against bacteria.
D. Eosinophils: Eosinophils are mainly involved in combating parasitic infections and modulating allergic responses, rather than acting as primary defenders against bacteria.
Correct Answer is A
Explanation
A. Providing structure and support: Connective tissue provides structural framework for the body, supports organs, binds tissues together, and stores energy in the form of fat. It also contributes to tissue repair and protection through its various types, such as bone, cartilage, and ligaments.
B. Covering and lining surfaces: Covering and lining surfaces is the function of epithelial tissue, which forms protective barriers and regulates substance exchange between the body and the environment.
C. Contracting to produce movement: Muscle tissue is responsible for contraction and movement of body parts, including voluntary and involuntary motion, rather than providing structural support.
D. Generating electrical impulses: Nervous tissue generates and transmits electrical impulses to coordinate body functions, but it does not provide the physical support and structural framework that connective tissue does.
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