Study "ALL HAP MEDIUM", a flashcard deck on FORKSAI.
Which of the following is a primary function of the endocrine system, distinguishing it from the nervous system?
A. Metabolism and tissue maturation. The endocrine system is known for its widespread, longer-lasting regulatory actions, which include processes like metabolism and tissue maturation, unlike the rapid, targeted signals of the nervous system.
The neuroendocrine system is responsible for controlling a variety of functions. Which of the following is NOT listed as a control function of the neuroendocrine system?
D. Direct transmission of signals between internal organs. While the neuroendocrine system ensures communication for homeostasis, the direct transmission of signals between internal organs is primarily a function of the nervous system alone, not a listed control function of the neuroendocrine system.
Hormones are classified into different types based on their chemical structure and how they interact with target cells. Which hormone class typically interacts with receptors on the cell surface because they cannot enter the cells?
C. Proteins and polypeptides. Proteins and polypeptides are large molecules that cannot easily pass through the cell membrane, so they bind to specific receptors located on the surface of target cells to exert their effects.
A patient is experiencing symptoms of increased cell sensitivity to a particular hormone. This phenomenon, where the number of receptors on target cells increases, is known as:
A. Up-regulation. Up-regulation refers to an increase in the number of receptors on target cells, which enhances the cell's sensitivity to a specific hormone.
Which of the following factors directly influences the physiological effect of a hormone?
C. Both its plasma concentration and the number of active receptors. The physiological effect of a hormone is directly related to both its concentration in the plasma and the quantity of active receptors present on target cells.
The hypothalamus plays a crucial role in maintaining homeostasis. Which of the following is a function primarily controlled by the hypothalamus?
B. Control of appetite, sexual behaviour, and emotional responses. The hypothalamus is critical for homeostasis and controls daily physiological cycles, appetite, sexual behaviour, emotional responses, and body temperature.
Which hormone, secreted by the posterior lobe of the pituitary gland, is primarily responsible for regulating water conservation?
A. ADH (vasopressin). Antidiuretic hormone (ADH), also known as vasopressin, is secreted by the posterior pituitary and plays a key role in regulating water balance by promoting water reabsorption in the kidneys.
A child is diagnosed with a condition characterized by excessive growth hormone (GH) production during childhood, leading to abnormally tall stature. This disorder is called:
B. Gigantism. Gigantism is a pituitary disorder resulting from excess growth hormone (GH) secretion during childhood, before the growth plates have fused, leading to overall increased body size.
The thyroid gland produces hormones that are essential for various metabolic processes. Which of the following is a primary function of T3 and T4 hormones?
D. Raising metabolic rate and increasing protein synthesis. Thyroid hormones (T3 and T4) are crucial for regulating metabolic rate, increasing protein synthesis, mitochondrial number, glucose uptake, glycolysis, gluconeogenesis, and lipid mobilization.
Which of the following endocrine glands is primarily responsible for regulating calcium levels by increasing bone resorption and calcium absorption?
C. Parathyroid glands. The parathyroid glands secrete parathyroid hormone (PTH), which is the main regulator of calcium levels in the blood, primarily by increasing bone resorption and calcium absorption.