What is the speed of the wave?

Correct Answer: D

Rationale: The correct answer is D: 600 cm/s. The speed of a wave is determined by the formula speed = frequency x wavelength. Given that the frequency and wavelength are constant, the only way to increase the speed is to increase the frequency or the wavelength. Since both frequency and wavelength are fixed, the speed can only be increased by increasing both. Choice D, 600 cm/s, is double the speed of choice C, 300 cm/s, which indicates that both frequency and wavelength have been doubled, leading to the correct answer. Choices A and B are too low to be correct, as they are not consistent with the principles of wave speed calculation.

Correct Answer: B

Rationale: Excess growth hormone suppresses cancer by promoting healthy cell growth and inhibiting apoptosis. Diabetes can result from growth hormone excess due to insulin resistance. Giantism in children and acromegaly in adults are both caused by excess growth hormone stimulating excessive skeletal and soft tissue growth. Therefore, the correct answer is B because excess growth hormone does not suppress cancer; it actually promotes cell growth and proliferation.

Correct Answer: A

Rationale: Step 1: The pituitary gland is located in the sella turcica of the sphenoid bone. Step 2: The cavernous sinus is a venous sinus located on each side of the sella turcica. Step 3: The pituitary gland lies laterally to the cavernous sinus. Step 4: Therefore, the correct answer is A: The cavernous sinus. Summary: B is incorrect as the hypothalamus is superior to the pituitary gland. C is incorrect as the diaphragma sellae is a part of the dura mater covering the pituitary gland. D is incorrect as the optic chiasma is located superior to the pituitary gland.

Correct Answer: b

Rationale: The correct answer is B: Adrenocorticotropic hormone (ACTH). ACTH is produced by the anterior lobe of the pituitary gland and stimulates the adrenal cortex to secrete cortisol. Inhibin is produced in the ovaries and testes, not the pituitary gland. Triiodothyronine is a thyroid hormone produced by the thyroid gland, not the pituitary gland. Oxytocin is produced by the posterior lobe of the pituitary gland, not the anterior lobe. Therefore, the correct answer is B because it is the hormone that originates from the anterior lobe of the pituitary gland.

Correct Answer: B

Rationale: The correct answer is B because steroids include glucocorticoids, mineralocorticoids, and androgens, which are hormones secreted by the adrenal cortex. Glucocorticoids regulate metabolism and immune response, mineralocorticoids regulate electrolyte balance, and androgens are male sex hormones. Choice A is incorrect because steroids are secreted by the adrenal cortex, not the adrenal medulla. Choice C is incorrect because steroids act by entering the target cells and binding to intracellular receptors, not by stimulating second messengers like cAMP. Choice D is incorrect because steroids are not secreted by the pancreas; instead, the pancreas secretes hormones like insulin and glucagon.