Which is TRUE concerning muscle tissue?
always under voluntary control
is a single-celled tissue
cuboidal shape enhances function
highly cellular and well vascularized
The Correct Answer is D
A. always under voluntary control: Not all muscle tissue is under voluntary control. Skeletal muscle is voluntary, but cardiac and smooth muscles are involuntary, functioning independently of conscious control.
B. is a single-celled tissue: Muscle tissue is not composed of a single cell type. Skeletal muscle fibers are multinucleated, cardiac muscle cells are branched with intercalated discs, and smooth muscle cells are spindle-shaped, showing structural diversity.
C. cuboidal shape enhances function: Muscle cells are elongated, not cuboidal. Their elongated shape allows efficient contraction and force generation, which would not be possible with cuboidal-shaped cells.
D. highly cellular and well vascularized: Muscle tissue consists mostly of cells with minimal extracellular matrix and requires a rich blood supply to deliver oxygen and nutrients for sustained contraction, making this the accurate statement.
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 D
Explanation
A. Cytokinesis:Cytokinesis is the process where the cytoplasm divides after mitosis, resulting in two separate daughter cells. It follows nuclear division but is not the division of the nucleus and DNA itself.
B. Transcription:Transcription is the process of copying genetic information from DNA into messenger RNA (mRNA). It is part of protein synthesis, not cell division.
C. Interphase:Interphase is the phase of the cell cycle where the cell grows, performs normal functions, and duplicates its DNA in preparation for division. However, it is not the stage where the nucleus and DNA actually divide.
D. Mitosis:Mitosis is the process of nuclear division where replicated chromosomes are separated into two nuclei. This ensures that each daughter cell receives an identical set of genetic material.
E. Translation:Translation is the process where ribosomes synthesize proteins using mRNA as a template. It occurs in protein production, not during nuclear or DNA division.
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