Which of the following is a key function of the lymphatic system?
Facilitating gas exchange
Returning excess fluid to the bloodstream
Digesting proteins
Producing red blood cells
The Correct Answer is B
A. Facilitating gas exchange: Gas exchange occurs in the respiratory system (alveoli), not the lymphatic system.
B. Returning excess fluid to the bloodstream: The lymphatic system collects interstitial fluid (lymph) and returns it to the venous circulation, preventing edema.
C. Digesting proteins: Protein digestion is performed by the gastrointestinal tract and its enzymes, not the lymphatic system.
D. Producing red blood cells: Hematopoiesis (red blood cell production) occurs in bone marrow, not the lymphatic system.
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Related Questions
Correct Answer is D
Explanation
A. Catecholamines:Catecholamines (such as epinephrine and norepinephrine) are derived from amino acids like tyrosine and act mainly through cell surface receptors, not by entering the cell to affect gene transcription.
B. Peptide hormones:Peptide hormones are chains of amino acids that bind to receptors on the cell surface because they are not lipid-soluble; they act via secondary messenger systems rather than directly influencing DNA transcription.
C. Thyroid hormones:Thyroid hormones are amino acid–derived but are lipid-soluble; they can enter cells and influence gene expression, although they are not cholesterol-derived.
D. Steroid hormones:Steroid hormones (e.g., cortisol, estrogen, testosterone) are synthesized from cholesterol and are lipid-soluble, allowing them to cross the cell membrane, bind intracellular receptors, and regulate gene transcription in the nucleus.
Correct Answer is D
Explanation
A. Growth hormone-releasing hormone (GHRH):GHRH from the hypothalamus stimulates growth hormone release from the anterior pituitary, not thyroid-stimulating hormone (TSH).
B. Gonadotropin-releasing hormone (GnRH):GnRH stimulates the anterior pituitary to release LH and FSH, which regulate the gonads rather than TSH.
C. Corticotropin-releasing hormone (CRH):CRH triggers ACTH release from the anterior pituitary, which acts on the adrenal cortex, not TSH.
D. Thyrotropin-releasing hormone (TRH):TRH from the hypothalamus specifically stimulates the anterior pituitary to secrete TSH, which in turn acts on the thyroid gland.
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