Which of the following is not a function of blood?
Produces plasma hormones
Transports a variety of nutrients
Helps to stabilize the pH of extracellular fluids
Helps to regulate body temperature
Participates in the initiation of blood clotting
The Correct Answer is A
A. Produces plasma hormones: blood does not produce hormones; endocrine organs secrete hormones into the blood. This statement is not a function of blood.
B. Transports a variety of nutrients: this is a function of blood (plasma carries nutrients to tissues).
C. Helps to stabilize the pH of extracellular fluids: this is a function; blood buffers (bicarbonate, proteins) help stabilize pH.
D. Helps to regulate body temperature: this is a function; blood redistributes heat and helps maintain temperature.
E. Participates in the initiation of blood clotting: this is a function; platelets and plasma clotting factors in blood participate in clot formation.
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Related Questions
Correct Answer is D
Explanation
A. alpha chains in hemoglobin: alpha chains are globin polypeptides that contribute to hemoglobin’s structure; O₂ binds to the heme prosthetic groups, not directly to the alpha globin chain.
B. delta chains in hemoglobin: delta chains (found in small amounts as HbA₂) are globin subunits; oxygen binding still occurs at heme groups, not the delta polypeptide.
C. beta chains in hemoglobin: beta chains are globin subunits that help form the O₂-binding pocket, but O₂ binds to the heme group (iron), not directly to the beta chain.
D. heme groups in hemoglobin: each hemoglobin has four heme groups (each with an Fe²⁺) that reversibly bind O₂; ~98–99% of blood O₂ is carried bound to hemoglobin’s heme.
E. the plasma membrane of erythrocytes: the RBC membrane does not bind O₂; O₂ diffuses across the membrane and is carried by hemoglobin inside the cell.
Correct Answer is E
Explanation
A. Growth hormone (GH): GH is secreted by the anterior pituitary (somatotrophs).
B. Corticotropic hormone (ACTH): ACTH is secreted by the anterior pituitary (corticotrophs).
C. Prolactin (PRL): PRL is secreted by the anterior pituitary (lactotrophs).
D. Thyroid hormone (TH): TH (T3/T4) is secreted by the thyroid gland, not the pituitary.
E. Oxytocin (OT): The posterior pituitary (neurohypophysis) releases oxytocin and ADH (though both are synthesized in the hypothalamus).
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