Study "All hap medium mcq", a flashcard deck on FORKSAI.
Which of the following best describes the primary difference in communication speed between the nervous and endocrine systems? A. The nervous system is slower and widespread, while the endocrine system is rapid and localized. B. The nervous system is rapid and localized, while the endocrine system is slower and widespread. C. Both systems are equally rapid but differ in the duration of their effects. D. Both systems are equally widespread but differ in their chemical messengers.
B. The nervous system generally allows rapid transmission of communication, whereas the endocrine system relies on hormone transport via the bloodstream for widespread, longer-lasting regulatory actions.
Hormones are classified into different types based on their chemical structure. Which class of hormones can typically enter target cells and interact with receptors inside the cytoplasm and nucleus? A. Proteins and polypeptides. B. Amino acid derivatives. C. Steroids (lipids). D. Catecholamines.
C. Steroids (lipids) are a class of hormones that can enter target cells and interact with receptors inside the cytoplasm and nucleus due to their lipid-soluble nature.
A patient is experiencing symptoms such as decreased metabolism, weight gain, and a lower heart rate. Which of the following thyroid disorders is most consistent with these symptoms? A. Hyperthyroidism. B. Hypothyroidism. C. Acromegaly. D. Cushing disease.
B. Hypothyroidism is characterized by low T3 and T4 levels, leading to decreased metabolism, heart rate, blood pressure, muscle tone, and often weight gain.
Which of the following is a primary function of the parathyroid glands? A. Regulating metabolic rate. B. Controlling blood glucose levels. C. Regulating calcium levels. D. Regulating circadian rhythms.
C. The parathyroid glands secrete Parathyroid Hormone (PTH), which primarily regulates calcium levels by increasing bone resorption and calcium absorption.
Which of the following hormones is secreted by the posterior lobe of the pituitary gland and regulates water conservation? A. TSH. B. ACTH. C. ADH (vasopressin). D. Prolactin.
C. ADH (vasopressin) is secreted by the posterior lobe of the pituitary gland and plays a crucial role in regulating water conservation, especially in response to high plasma osmolarity or low plasma volume.
What is the term for an increase in the number of hormone receptors on target cells, leading to enhanced cellular sensitivity? A. Down-regulation. B. Up-regulation. C. Homeostasis. D. Hormone-receptor complex.
B. Up-regulation refers to an increase in receptor numbers, which enhances cell sensitivity to a particular hormone.
Which of the following is NOT a function controlled by the neuroendocrine system? A. Fine and gross motor movements. B. Language. C. Transmission of signals between the brain and internal organs. D. Sociosexual functions.
C. Transmission of signals between the brain and internal organs is primarily a function of the nervous system, whereas the neuroendocrine system controls functions like motor movements, language, and sociosexual functions.
A non-cancerous tumor producing prolactin is known as which of the following pituitary disorders? A. Acromegaly. B. Gigantism. C. Prolactinoma. D. Cushing disease/syndrome.
C. Prolactinoma is a specific pituitary disorder characterized by a non-cancerous tumor that produces excess prolactin.
The physiological effect of a hormone is directly related to which two factors? A. Rate of hormone secretion and quantity of transport proteins. B. Rate of metabolism and changes in plasma volume. C. Plasma concentration and number of active receptors. D. Hormone class and receptor regulation.
C. The physiological effect of a hormone is directly related to its plasma concentration and the number of active receptors present on target cells.
Which gland is responsible for secreting melatonin, a hormone that regulates circadian rhythms? A. Thyroid gland. B. Adrenal glands. C. Pineal gland. D. Pancreas.
C. The pineal gland is responsible for secreting melatonin, which plays a key role in regulating circadian rhythms and reproductive hormones.