The formation of blackheads on the skin is a result of blockage of which of the following types of gland?
Lacrimal
Sebaceous
Sweat
Ceruminous
The Correct Answer is B
A. Lacrimal glands produce tears and are not involved in the formation of blackheads.
B. Sebaceous glands secrete sebum, an oily substance that can clog hair follicles when produced in excess. This blockage, combined with oxidation, leads to the formation of blackheads on the skin.
C. Sweat glands produce sweat and are not involved in the formation of blackheads, which result from excess sebum and not sweat.
D. Ceruminous glands secrete earwax (cerumen) and are not involved in blackhead formation, as they are located in the ear canal and not on the skin's surface.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Generating and transmitting impulses is the primary function of nervous tissue, not connective tissue. Nervous tissue is responsible for carrying signals throughout the body.
B. Covering and lining body surfaces is the function of epithelial tissue, which forms the skin and the lining of organs, not connective tissue.
C. Contracting and bringing about movement is the function of muscle tissue, not connective tissue. Muscle tissue is responsible for contraction and body movement.
D. Connective tissue's main function is to bind other tissues together and provide structural support. It includes tissues such as bone, blood, cartilage, and tendons, all of which help support, protect, and connect other tissues and organs.
Correct Answer is A
Explanation
A. The diaphysis is the shaft of a long bone, the central part that extends between the two epiphyses (ends). It is primarily composed of compact bone and houses the bone marrow.
B. The periosteum is a dense layer of connective tissue that covers the outer surface of bones, except at the joints. It does not represent the shaft of the bone.
C. The cortex refers to the outer layer of the bone, specifically the compact bone that surrounds the spongy bone in the diaphysis. It is not synonymous with the shaft.
D. Osteoid is the organic matrix of bone tissue, composed of collagen and other proteins, but it does not refer to the shaft of a bone.
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