Heart muscle cells would tend to separate or pull apart without
intercalated discs
stroma
myofilaments
flana
The Correct Answer is A
A. intercalated discs: Intercalated discs connect cardiac muscle cells and contain desmosomes and gap junctions. Desmosomes provide mechanical strength to prevent cells from pulling apart during contractions, while gap junctions allow coordinated electrical signaling.
B. stroma: Stroma refers to the supportive connective tissue framework in organs. While it provides general support, it does not directly prevent cardiac muscle cells from separating during contraction.
C. myofilaments: Myofilaments, including actin and myosin, generate the contractile force in muscle cells. They are essential for contraction but do not provide structural adhesion between cells.
D. flana: Flana is not a recognized anatomical or histological structure in cardiac tissue, so it has no role in maintaining the cohesion of heart muscle cells.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. stratum basale:This is the deepest layer of the epidermis, consisting of mitotically active basal cells. Its main function is cell division and replacement of superficial layers, not the initiation of keratinization.
B. stratum lucidum:This clear layer is found only in thick skin, such as the palms and soles. It contains densely packed keratin, but keratinization has already occurred before this stage.
C. stratum spinosum:Cells in this layer begin producing keratin and keratohyalin, initiating the process of keratinization. The spiny appearance of the cells is due to desmosomal attachments, which help strengthen the epidermis.
D. stratum corneum:This outermost layer is composed of fully keratinized, dead cells. By this stage, keratinization is complete, and cells are flattened, providing a protective barrier.
Correct Answer is A
Explanation
A. a segment of DNA that carries the instructions for one protein:A gene is a functional unit of DNA that contains the necessary coding sequence to produce a specific protein. It includes exons, which code for amino acids, and regulatory regions that control expression.
B. a strand of introns only:Introns are non-coding segments within a gene that are removed during RNA processing. A gene is not composed solely of introns, as it also contains exons that determine protein structure.
C. an RNA messenger that codes for a particular polypeptide:Messenger RNA is the transcript produced from a gene. While it carries the code for a protein, the gene itself is the DNA sequence, not the RNA product.
D. a three-base triplet that specifies a particular amino acid:A three-base triplet is a codon in mRNA, which specifies a single amino acid during translation. A gene consists of many codons and encompasses the full sequence necessary for the entire protein.
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