Biology Multiple Choice Questions on “Chemical Control and Coordination – Human Endocrine System – 3”.
1. Which of these is not a function of thyroid hormones?
a) Regulation of basal metabolic rate
b) Erythropoiesis
c) Maintenance of electrolyte balance
d) Regulation of diurnal cycle
Answer: d
Clarification: Thyroid hormones are important for the regulation of basal metabolic rate. It also helps erythropoiesis and maintains water and electrolyte balance. However, the pineal gland regulates the diurnal cycle.
2. TCT is secreted by the ______
a) hypothalamus
b) pituitary gland
c) thyroid gland
d) adrenal cortex
Answer: c
Clarification: TCT or thyrocalcitonin is secreted by the thyroid gland, along with thyroxine and triiodothyronine. The function of thyrocalcitonin is to regulate the blood calcium level. Thyrocalcitonin is a protein hormone.
3. How many parathyroid glands do humans possess?
a) 2
b) 3
c) 4
d) 1
Answer: c
Clarification: Humans possess 4 parathyroid glands. They are present on the back side of the thyroid glands. The thyroid gland has two lobes. Each lobe of the thyroid gland contains one pair of parathyroid glands.
4. Which of these is not a function of PTH?
a) Reduces calcium ion reabsorption from digested food
b) Increases calcium ion level in blood
c) Stimulates demineralization
d) Stimulates reabsorption of calcium ions in kidneys
Answer: a
Clarification: PTH or parathyroid hormone is secreted by the parathyroid gland. It is important for regulating the blood calcium level along with thyrocalcitonin. PTH increases calcium ion absorption from digested food.
5. What is the shape of the thymus gland?
a) Spherical
b) Lobular
c) Irregular
d) Triangular
Answer: b
Clarification: The thymus gland is lobular in shape. It is an important lymphatic organ. The thymus is situated behind the sternum and between the lungs. It secretes thymosin which is a peptide hormone.
6. Which of these statements is false about thymus?
a) Differentiation of T-lymphocytes take place here
b) It secretes thymosin
c) It is intact for persons of all ages
d) Promotes production of antibodies
Answer: c
Clarification: Thymus is an endocrine gland situated between the lungs and behind the sternum. It secretes thymosin and the differentiation of T-lymphocytes takes place here. It promotes antibody production. However, the thymus degenerates in old individuals.
7. Where are the adrenal glands located?
a) Above the kidneys
b) Between the lungs
c) Around the trachea
d) Base of the hypothalamus
Answer: a
Clarification: The adrenal glands are located just above the kidneys. It is pyramidal in shape. The thyroid gland is located around the trachea, the thymus is located between the lungs and the pituitary gland is located at the base of the hypothalamus.
8. Identify the structure in the given below.
a) Pineal gland
b) Thymus
c) Parathyroid gland
d) Adrenal gland
Answer: d
Clarification: The given picture shows a kidney with a pyramidal structure above it. This is the adrenal gland which is an endocrine gland. The adrenal gland is divided into two parts- the outer cortex and the inner medulla.
9. What is the disease caused by the deficiency of adrenal cortex hormones?
a) Acromegaly
b) Graves’ disease
c) Addison’s disease
d) Diabetes Insipidus