Which muscle type is involuntary and found in the walls of hollow organs?
Striated muscle
Cardiac muscle
Smooth muscle
Skeletal muscle
The Correct Answer is C
A. Striated muscle: Striated muscle refers to muscle with a banded appearance and includes skeletal and cardiac muscle; it is not the typical involuntary muscle of hollow organs.
B. Cardiac muscle: Cardiac muscle is involuntary and striated but is specific to the heart rather than the walls of most hollow organs.
C. Smooth muscle: Smooth muscle is non-striated, involuntary, and forms the walls of hollow organs (for example blood vessels, the gastrointestinal tract, and the bladder).
D. Skeletal muscle: Skeletal muscle is striated and under voluntary control, primarily attached to bones for movement.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Fibrocartilaginous callus formation:Fibrocartilaginous callus formation is an early reparative stage that follows hematoma organization, helping bridge the fracture but does not occur first.
B. Formation of a bony callus:Formation of a bony (ossified) callus occurs after the fibrocartilaginous callus is replaced by woven bone during repair.
C. Hematoma formation:Hematoma formation occurs immediately after the fracture as blood vessels rupture, creating a clot that initiates inflammation and brings cells needed for healing.
D. Remodeling of bone:Remodeling is the final phase in which woven bone is replaced by lamellar bone and the medullary canal is restored; it occurs well after initial healing.
Correct Answer is A
Explanation
A. Secretion of sebum:Sebaceous glands secrete sebum, an oily substance that lubricates and helps waterproof the skin and hair.
B. Production of melanin:Melanin is produced by melanocytes in the epidermis rather than by sebaceous glands.
C. Protection against UV radiation:Protection from UV radiation is mainly provided by melanin produced by epidermal melanocytes, not by sebaceous gland secretions.
D. Temperature regulation:Temperature regulation is achieved primarily through eccrine sweat glands and cutaneous blood flow, not by sebaceous gland activity.
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