Which of the following integral proteins allows ions to pass into or out of the cell?
Receptor
Channel
Ligand
Peripheral
The Correct Answer is B
a: Receptor - Receptors are proteins that bind to signaling molecules (ligands) outside the cell and initiate cellular responses but do not typically facilitate ion movement.
b. Channel-Integral membrane proteins called ion channels create pores in the cell membrane, allowing specific ions to pass through, thus facilitating ion movement into or out of the cell.
c: Ligand - Ligands are signaling molecules that bind to receptors, activating them, but they do not facilitate ion movement.
d: Peripheral - Peripheral proteins are found on the surface of the cell membrane but are not typically involved in creating ion channels
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
a. Ureters are connected inside the urinary bladder by a two-way valve: The ureters connect to the urinary bladder through openings that act as one-way valves to prevent urine from flowing back into the ureters.
b. Ureters are fibrotic tubes connecting the kidneys to the urinary bladder: Ureters are not fibrotic; they are muscular tubes lined with a mucous membrane that propels urine from the kidneys to the bladder.
c. Ureters are covered by an outer layer of epithelial tissue: The outermost layer of the ureters is actually composed of connective tissue (adventitia), not epithelial tissue.
d. Ureters are extraperitoneal tubular structures: This is correct. Ureters are located outside the peritoneal cavity.
Correct Answer is C
Explanation
a: Adrenal cortex and calcitonin hormone - Calcitonin is primarily secreted by the thyroid gland, not the adrenal cortex.
b: Hypothalamus and prolactin hormone - Prolactin is primarily secreted by the anterior pituitary gland, not the hypothalamus.
c. Anterior pituitary and growth hormone -The anterior pituitary gland secretes growth hormone (GH), which regulates growth, metabolism, and development.
d: Thyroid and thyroid-stimulating hormone - Thyroid-stimulating hormone (TSH) is secreted by the anterior pituitary gland, not the thyroid gland directly.
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