Concept explainers
Introduction:
There are clusters of specialized cells present in the hypothalamus which are known as neurosecretory cells. Thin fibers or axons are grown by neurosecretory cells which end in capillary bed and connect hypothalamus to anterior lobe of the pituitary. The neurosecretory cells produce six different regulatory hormones which can be either releasing or inhibiting hormones.
Answer to Problem 1MC
Correct answer:
The neurosecretory cells in the hypothalamus produce hormones which are involved in the reabsorption of water by the kidney. Therefore, option (c) is correct.
Option (c) is given as “produce hormones that regulate water reabsorption in the kidney”.
Explanation of Solution
Justify reasons for the correct statement:
The neurosecretory cells of the hypothalamus are involved in the synthesis of peptide hormones, their storage, and release. The neurosecretory cells produce antidiuretic hormone and oxytocin hormone. The antidiuretic hormone maintains blood pressure, tissue water, and volume of blood by regulating the amount of water and thereby controlling the concentration of urine.
Hence, option (c) is correct.
Justify reasons for the incorrect statements:
Option (a) is given as “release growth hormone and prolactin”.
The growth hormone and prolactin are released by the anterior lobe of the pituitary. Prolactin stimulates the development of mammary glands and growth hormone stimulates the growth of bone and increases synthesis of proteins. These hormones are not released by neurosecretory cells. Hence, it is a wrong answer.
Option (b) is given as “release hormones that control hormone secretion by cells in the posterior pituitary”.
The neurosecretory cells in the hypothalamus release six different regulatory hormones. All these hormones regulate the release of hormones from the anterior lobe of the pituitary. The hormones released by neurosecretory cells do not regulate hormonal secretion of posterior pituitary. Hence, it is a wrong answer.
Option (d) is given as “produce hormones that stimulate glucose uptake by muscle cells”.
The hormone which stimulates the uptake of glucose by muscle cells is insulin. Insulin is produced by beta cells of the pancreas and not neurosecretory cells in the hypothalamus. Hence, it is a wrong answer.
Hence, options (a), (b), and (d) are incorrect.
The neurosecretory cells in hypothalamus form axons which end in the capillary bed in the stalk which connects hypothalamus to anterior lobe of the pituitary. These cells secrete six different regulatory hormones which regulate the hormonal secretion of the anterior pituitary. Apart from these six hormones, neurosecretory cells also release oxytocin and antidiuretic hormone. The antidiuretic hormone regulates the reabsorption of water by the kidney.
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Chapter 38 Solutions
Biology
- All of the following hormones are released from the hypothalamus to control the anterior pituitary gland except a. growth-releasing hormone (GRH). b. antidiuretic hormone (ADH). c. prolactin-releasing hormone (PRH). d. corticotropin-releasing hormone (CRH).arrow_forwardWhich of the following statements regarding the adrenal gland is true?a. The parasympathetic division stimulates the adrenal gland torelease acetylcholine.b. The parasympathetic division stimulates the adrenal gland to releaseepinephrine.c. The sympathetic division stimulates the adrenal gland torelease acetylcholine.d. The sympathetic division stimulates the adrenal gland to releaseepinephrinearrow_forwardThe hypothalamus and pituitary gland are considered equally important since the former: a. Tells the pituitary gland what to release and when. b. Brings in substance from the thyroid. c. Contracts and relaxes to regulate the master gland d. Stores and releases secretions of pituitary glandarrow_forward
- Which of the following statements about steroid and non-steroid hormones is false?a. Non-steroid hormones typically act through second messengers such as cAMP.b. Non-steroid hormones are not lipid soluble and cannot enter the target cell.c. Steroid hormones act usually slower than non-steroid hormones.d. Cortisol and aldosterone are non-steroid hormones that are produced by the cortex of the adrenal glandarrow_forward* The hypothalamic neurons that supply the structure that contain the asterisk: a. Synapse directly on their target b. Release hormone into the hypophyseal portal blood stream c. Contain neurosecretory granules that accumulate in axon swellings d. Release either growth hormone or prolactin|arrow_forwardWhich of the following acts as the link between the nervous systemand the endocrine system?a. posterior pituitary gland b. hypothalamusc. anterior pituitary gland d. parathyroidarrow_forward
- Which is the following is an example of the nervous system directly interacting with the endocrine system? a. The secretion of cortisol early in the morning b. The continuous secretion of thyroid hormone c. The secretion of epinephrine and norepinephrine during the fight or flight response d. The secretion of insulin after a mealarrow_forwardThe adrenal medulla is derived from what type of tissue? .A. Nervous tissue . B.Connective tissue .C Muscle Tissue D. Epithelial tissuearrow_forwardWhich of the following hormones are NOT released in response to releasing hormones secreted by the hypothalamus? a. FSH and LH b. ADH and prostaglandin c. Oxytocin and thyroxine d. hGH and calcitoninarrow_forward
- a. Neurosecretory 52. Which is the following is an example of the nervous system directly i system? a. The secretion of cortisol early in the morning b. The continuous secretion of thyroid hormone c. The secretion of epinephrine and norepinephrine during the fi The secretion of insulin after a mealarrow_forwardA hormone released from the anterior pituitary is a. glucagon. b. growth hormone (GH). c. melatonin. d. epinephrine.arrow_forwardMatch the adrenal hormones with their source and actions. (1) cortisol (2) aldosterone (3) epinephrine A. cortex; sodium retention B. cortex; fatty acid release C. medulla; fight-or-flight responsearrow_forward
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