Nokea
Concerning catecholamines, all the following are true EXCEPT:
- A. They contain a catechol nucleus
- B. They act directly on the receptor
- C. Have a short duration of action
- D. Include ephedrine and amphetamine
Correct Answer: D
Rationale: The correct answer is D because ephedrine and amphetamine are not catecholamines. A is correct as catecholamines contain a catechol nucleus. B is true as they act directly on receptors. C is also true since catecholamines have a short duration of action. Therefore, D is the incorrect statement as ephedrine and amphetamine do not fall under the category of catecholamines due to their chemical structure and mode of action.
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This is Not an Endocrine Gland
- A. Adrenal
- B. Pituitary
- C. Lacrimal
- D. Thyroid
Correct Answer: C
Rationale: The correct answer is C: Lacrimal gland. The lacrimal gland is not an endocrine gland because it does not secrete hormones into the bloodstream. It produces tears to lubricate and cleanse the eyes. Adrenal, Pituitary, and Thyroid glands are endocrine glands that secrete hormones directly into the bloodstream to regulate various functions in the body. Adrenal glands produce cortisol and adrenaline, Pituitary gland regulates other endocrine glands, and Thyroid gland produces thyroid hormones. Therefore, Lacrimal gland is the correct answer as it does not secrete hormones into the bloodstream like the other choices.
Which row identifies the product at each electrode?
- A. bromide ions, lead ions
- B. bromine, lead
- C. lead ions, bromide ions
- D. lead, bromine
Correct Answer: D
Rationale: The correct answer is D because lead is the product at the cathode (negative electrode) during electrolysis, while bromine is the product at the anode (positive electrode). Lead is reduced at the cathode to form lead metal, and bromine is oxidized at the anode to form bromine gas. This is in line with the general rule that cations are attracted to the cathode and are reduced, while anions are attracted to the anode and are oxidized.
Choice A is incorrect as bromide ions are reduced at the cathode, not lead ions. Choice B is incorrect because bromine is produced at the anode, not lead. Choice C is incorrect because lead ions are reduced at the cathode, not bromide ions.
Which is absorbed mainly in the colon?
- A. short chain fatty acids
- B. calcium
- C. vitamin K
- D. oligosaccharides
Correct Answer: A
Rationale: The correct answer is A: short chain fatty acids. The colon is where most of the absorption of short chain fatty acids occurs after digestion in the small intestine. Short chain fatty acids are produced by gut bacteria breaking down dietary fiber and play a crucial role in energy production and maintaining gut health. Calcium is primarily absorbed in the small intestine, vitamin K is absorbed in the small intestine and liver, and oligosaccharides are mainly broken down in the small intestine by enzymes. Therefore, A is the correct answer as it aligns with the specific absorption function of the colon.
Gonadocorticoid(s) ________.
- A. synthesized by the adrenal medulla are primarily androgens
- B. production by the adrenal gland is insignificant compared with sex hormone release from the gonads during late puberty
- C. secretion inhibition is highly dependent on a negative feedback loop involving ACTH
- D. hypersecretion can result in adrenogenital syndrome, also called feminization
Correct Answer: B
Rationale: The correct answer is B because during late puberty, the production of sex hormones by the gonads significantly outweighs the production of gonadocorticoids by the adrenal gland. This is due to the maturation and increased activity of the gonads during this developmental stage.
Rationale:
A: Synthesized by the adrenal medulla are primarily catecholamines, not androgens.
C: Secretion inhibition of gonadocorticoids is primarily regulated by the renin-angiotensin-aldosterone system, not solely by a negative feedback loop involving ACTH.
D: Hypersecretion of gonadocorticoids can lead to conditions like Cushing's syndrome, not adrenogenital syndrome or feminization.
The enzyme amylase breaks down?
- A. Carbohydrates
- B. Proteins
- C. Fats
Correct Answer: A
Rationale: The correct answer is A: Carbohydrates. Amylase is an enzyme that specifically breaks down carbohydrates, such as starch and glycogen, into simpler sugars like glucose. It does this by catalyzing the hydrolysis of alpha-1,4-glycosidic linkages in polysaccharides. Proteins are broken down by protease enzymes, not amylase. Fats are broken down by lipase enzymes. Choice D is incomplete and does not provide a relevant option.