Which type of cellular junction allows for communication between adjacent cells?
smart junctions
gap junctions
desmosomes
tight junctions
phagosomes
The Correct Answer is B
A. Smart junctions: This is not a recognized type of cellular junction in human physiology. The main junctions are gap junctions, tight junctions, and desmosomes, each serving different structural or communicative roles.
B. Gap junctions: Gap junctions are specialized connections that allow direct communication between adjacent cells. They form protein channels called connexons, which permit the passage of ions, nutrients, and signaling molecules, enabling coordinated cellular activity.
C. Desmosomes: Desmosomes provide strong adhesion between cells, particularly in tissues exposed to mechanical stress such as skin and heart muscle. Their role is structural, preventing cells from being pulled apart, not in communication.
D. Tight junctions: Tight junctions act as barriers by sealing neighboring cells together, preventing leakage of substances between them. They regulate permeability but do not allow the transfer of signals or molecules for communication.
E. Phagosomes: Phagosomes are intracellular vesicles formed during phagocytosis when a cell engulfs particles. They are part of the immune and digestive processes within cells and are not related to junctional communication between adjacent cells.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. I: Iodine is essential for thyroid hormone production, which regulates metabolism. However, it does not play a direct role in generating or transmitting nerve impulses.
B. P: Phosphorus is a key component of ATP, nucleic acids, and phospholipids in cell membranes. While it supports energy metabolism, it is not directly responsible for nerve impulse conduction.
C. Fe: Iron is primarily required for hemoglobin and myoglobin to transport oxygen. It is vital for cellular respiration but does not contribute to the electrical activity of neurons.
D. Na: Sodium ions are critical for nerve impulse conduction. During action potentials, sodium influx into neurons initiates depolarization, making sodium indispensable for proper nerve signaling.
Correct Answer is B
Explanation
A. Spinal cord: The spinal cord is housed within the vertebral cavity, which is part of the dorsal cavity. It is protected by the vertebrae and surrounded by cerebrospinal fluid.
B. Thoracic cavity: The thoracic cavity is part of the ventral cavity, not the dorsal cavity. It contains the heart and lungs and is separated from the abdominal cavity by the diaphragm.
C. Vertebral cavity: The vertebral cavity encloses the spinal cord and is a key subdivision of the dorsal cavity, providing protection and structural support.
D. Cranial cavity: The cranial cavity contains the brain and is located within the skull. It is a major component of the dorsal cavity, working with the vertebral cavity to protect the central nervous system.
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