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Heart muscle cells would tend to separate or pull apart without

A.

intercalated discs

B.

stroma

C.

myofilaments

D.

flana

Answer and Explanation

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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Related Questions

Correct Answer is C

Explanation

A. organism:An organism is the entire living being composed of multiple organ systems working together, not a single group of similar cells.

B. organ system:An organ system consists of multiple organs that perform related functions, but it is a higher level of organization than a single tissue.

C. tissue:Tissue is a group of cells with similar structure that work together to perform a specific or related function, such as muscle tissue contracting or epithelial tissue providing protection.

D. organ:An organ is composed of multiple tissue types working together to perform complex functions, making it a larger structural unit than a tissue.

Correct Answer is B

Explanation

A. Mature adipose cells are highly mitotic:Mature adipocytes do not actively divide. Instead, new adipocytes are formed from precursor cells, and mature ones primarily increase in size rather than number.

B. Its primary function is to store triglycerides:Adipose tissue serves mainly as an energy reservoir by storing triglycerides. It also provides insulation, cushioning, and contributes to endocrine functions by releasing hormones like leptin.

C. Most of the cell volume is occupied by the nucleus:In adipocytes, the nucleus is pushed to the periphery of the cell by a large lipid droplet. The majority of the cell volume is taken up by stored fat, not the nucleus.

D. It is composed mostly of extracellular matrix:Unlike connective tissues such as bone or cartilage, adipose tissue has relatively little extracellular matrix. The tissue is mainly composed of densely packed fat cells.

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