Glands, such as the thyroid, that secrete their products directly into the blood rather than through ducts are classified as ________ glands.
sebaceous
exocrine
endocrine
ceruminous
The Correct Answer is C
A. sebaceous: Sebaceous glands are exocrine glands that release sebum into hair follicles or onto the skin surface through ducts. They are not involved in direct secretion into the bloodstream.
B. exocrine: Exocrine glands secrete their products through ducts onto epithelial surfaces, such as sweat or salivary glands. They differ from endocrine glands, which release secretions directly into the blood.
C. endocrine: Endocrine glands, including the thyroid, pituitary, and adrenal glands, secrete hormones directly into the bloodstream. These hormones regulate numerous physiological processes throughout the body.
D. ceruminous: Ceruminous glands are specialized exocrine glands in the ear canal that secrete cerumen (earwax). They release their product via ducts, not into the blood.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. metaphase plate:The metaphase plate is the imaginary plane in the middle of the cell where chromosomes align during metaphase. It does not involve actin filaments or the separation of daughter cells.
B. cleavage furrow:The cleavage furrow is formed by a contractile ring of actin filaments that tightens to constrict the cell membrane. This process physically separates the cytoplasm, resulting in two distinct daughter cells during cytokinesis.
C. mitotic spindle:The mitotic spindle is composed of microtubules that attach to chromosomes and move them during mitosis. It functions in chromosome segregation, not in the physical pinching of the cytoplasm.
D. centrosome:The centrosome is the microtubule-organizing center that helps form the mitotic spindle. While crucial in mitosis, it does not participate in the contraction needed for cell cleavage.
E. centromere:The centromere is the region where sister chromatids are attached and where spindle fibers connect during chromosome separation. It plays no role in the actin-driven division of the cytoplasm.
Correct Answer is B
Explanation
A. mammary and ceruminous:Mammary and ceruminous glands are specialized glands that produce milk and earwax, respectively. They are not classified as the main types of sweat glands.
B. eccrine and apocrine:Eccrine glands are widely distributed and produce watery sweat for thermoregulation, while apocrine glands are found in specific areas like the axillae and groin and secrete thicker sweat associated with scent. These two categories constitute the primary types of sudoriferous glands.
C. holocrine and mammary:Holocrine glands, such as sebaceous glands, release their product via whole-cell rupture and are not sweat glands. Mammary glands are specialized exocrine glands, so this pairing does not represent the main sweat gland types.
D. sebaceous and merocrine:Sebaceous glands secrete sebum and are oil-producing, not sweat-producing. Merocrine is another term for eccrine secretion, but the pairing with sebaceous glands incorrectly categorizes sweat glands.
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