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NEET Questions / Zoology / Structural Organisation In Animals
Which statement regarding the specialized junctions between epithelial cells is INCORRECT?
Tight junctions facilitate communication between adjacent cells.
Adherens junctions contribute to the structural integrity of epithelial tissues.
Desmosomes provide strong adhesion between adjacent cells, using cadherins linked to intermediate filaments.
Gap junctions allow the passage of small molecules and ions between adjacent cells.
Which of the following is NOT a characteristic of neuroglia?
Supporting neurons
Insulating neurons
Conducting nerve impulses
Providing nutrients to neurons
Dense regular connective tissue, found in tendons and ligaments, primarily contains which type of fiber arrangement?
Randomly arranged collagen and elastic fibers
Parallel bundles of collagen fibers
A network of reticular fibers
Predominantly elastic fibers
Which statement regarding the basal lamina of epithelial tissue is INCORRECT?
It influences cell polarity.
It regulates cell proliferation and differentiation.
It is rich in reticular fibers.
It acts as a selective filter for molecules.
Which of the following is NOT a characteristic feature of pseudostratified columnar epithelium?
Nuclei appear at different levels, giving a stratified appearance.
All cells rest on the basement membrane and reach the apical surface.
It often contains cilia or goblet cells.
It lines portions of the respiratory tract.
A unique feature of smooth muscle fibers, unlike skeletal and cardiac muscles, is their ability to:
Contract rhythmically and spontaneously
Maintain tension over a wide range of lengths (stress-relaxation response)
Be stimulated by neurotransmitters released from somatic motor neurons
Appear striated under a microscope
The dense bodies in smooth muscle are analogous to which structure in skeletal muscle?
Z-lines
M-lines
H-zones
A-bands
Earthworms possess specialized cells called chloragogen cells. These cells are primarily involved in:
Excretion of nitrogenous wastes
Synthesis and storage of glycogen and fat
Regulation of osmotic balance
Production of digestive enzymes
The typhlosole in the earthworm's intestine primarily functions to:
Grind ingested food particles
Store undigested food material
Increase the surface area for absorption
Secrete digestive enzymes
Which specific characteristic distinguishes the Nodes of Ranvier from the rest of the myelinated axon in terms of ion channel distribution?
High density of voltage-gated potassium channels
High density of voltage-gated sodium channels
Absence of ion channels
Presence of ligand-gated chloride channels
