Which vessel type is primarily involved in regulating blood pressure by changing diameter?

A. Muscle tissue: Muscle tissue is involved in movement and support, not in detecting sensory stimuli such as temperature changes.

B. Subcutaneous layer: The subcutaneous layer primarily provides insulation and padding for the body, but it contains fewer sensory receptors for temperature detection.

C. Dermis: The dermis houses thermoreceptors, specialized nerve endings that detect changes in temperature. Damage or dysfunction in this layer can impair the ability to sense heat or cold.

D. Epidermis: The epidermis primarily serves as a protective barrier and does not contain the majority of temperature-sensitive sensory receptors.

A. Adrenal cortex: The adrenal cortex secretes aldosterone, a hormone that regulates sodium and potassium levels by increasing sodium reabsorption and potassium excretion in the kidneys. This helps maintain blood pressure, fluid balance, and electrolyte homeostasis.

B. Pancreas: The pancreas produces insulin and glucagon to regulate blood glucose levels. It does not have a direct role in sodium or potassium balance.

C. Pineal gland: The pineal gland secretes melatonin, which regulates circadian rhythms and sleep-wake cycles. It is not involved in electrolyte regulation.

D. Thyroid gland: The thyroid gland produces thyroid hormones that regulate metabolism, growth, and development. It does not directly control sodium or potassium homeostasis in the body.