Thyroid stimulating hormone regulates the following:

Correct Answer: D

Rationale: Thyroid stimulating hormone (TSH) regulates all the mentioned functions. 1. A: TSH stimulates iodine uptake by thyroid follicular cells for thyroid hormone synthesis. 2. B: TSH promotes the biosynthesis of iodothyroglobulin, a precursor of thyroid hormones. 3. C: TSH triggers the release of thyroid hormones into the bloodstream. Therefore, the correct answer is D as TSH regulates all these processes essential for thyroid hormone production and release. Other choices are incorrect as they do not encompass all the functions regulated by TSH.

Correct Answer: A

Rationale: The statement accurately describes the immune system, making choice A true. The immune system indeed consists of organs, tissues, cells, and cell products that distinguish self from nonself and combat harmful pathogens. Choice B is incorrect as the statement is true. Choice C is incorrect as it implies all choices are correct, which is not the case. Choice D is incorrect as the statement is true, so it is not "none."

Correct Answer: B

Rationale: The correct answer is B: Immunosuppressive agents. Tacrolimus (FK-506) belongs to this class as it suppresses the immune system. It is commonly used in transplant patients to prevent organ rejection by inhibiting T-cell activation. Immunoglobulins (A) are antibodies produced by the immune system. Interferons (C) are signaling proteins released by cells in response to pathogens. Monoclonal antibodies (D) are antibodies produced by identical immune cells and used for targeted therapies. Therefore, the most appropriate classification for tacrolimus is as an immunosuppressive agent due to its mechanism of action and therapeutic use in modulating the immune response.

Correct Answer: A

Rationale: Step 1: Identify the antienzyme that inhibits proteolysis. Proteolysis is the breakdown of proteins into smaller peptides or amino acids by proteolytic enzymes. Step 2: Contrical is a proteolysis inhibitor that specifically inhibits trypsin, a digestive enzyme that breaks down proteins in the small intestine. Step 3: Sulbactam is a beta-lactamase inhibitor used in combination with antibiotics to prevent bacterial resistance. Step 4: Aminocaproic acid is a fibrinolysis inhibitor used to prevent excessive blood clot breakdown. Step 5: Disulfiram is an alcohol deterrent that inhibits aldehyde dehydrogenase, not proteolysis. Summary: Contrical (Choice A) is the correct answer as it directly inhibits a proteolytic enzyme involved in protein breakdown. Sulbactam, aminocaproic acid, and disulfiram do not target proteolysis enzymes.

Correct Answer: B

Rationale: Rationale: 1. Probucol does not stimulate the rate of clearance of LDL by receptor-mediated pathways. 2. Probucol works by increasing HDL levels and reducing LDL oxidation. 3. Therefore, the statement that Probucol stimulates LDL clearance is false. 4. Choice B is correct as it accurately reflects the mechanism of action of Probucol. Summary: - Choice A is incorrect as Probucol does not stimulate LDL clearance. - Choice C is incorrect as not all statements are true. - Choice D is incorrect as the statement is false.