This set of Human Physiology Multiple Choice Questions & Answers (MCQs) focuses on “Chemical Coordination and Integration – Thymus & Pineal Body”.
1. Hassall’s corpuscles are found in _________
a) Adrenalin gland
b) Spleen
c) Thymus
d) Parathyroid gland
View Answer
Explanation: Hassall’s corpuscles are found in the medulla of thymus. It is formed from eosinophillic type IV epithelial reticular cells arranged concentrically.
2. Damage to thymus in a child may lead to __________
a) Loss of cell mediated immunity
b) Loss of antibody mediated immunity
c) Reduction in stem cell production
d) Reduction in hemoglobin content
View Answer
Explanation: Cell mediated immunity is an immune response that does not involve antibodies but involves activation of phagocytes, antigen-specific cytotoxic T-lymphocytes and releases various cytokines in response to antigen.
3. Mammalian thymus is mainly associated with _________
a) Secretion of thyrotrophin
b) Regulation of body growth
c) Regulation of body temperature
d) Immunological functions
View Answer
Explanation: Thymus is located in the neck. It produces T Lymphocytes for the immune system. Mammalian thymus is mainly associated with Immunological functions.
4. Thymus size increases with aging.
a) True
b) False
View Answer
Explanation: Thymus size decreases with aging. Human thymus becomes much smaller at the approach of puberty.
5. Thymus aids differentiation of ___________ cells.
a) Red blood
b) B
c) T
d) Cancerous
View Answer
Explanation: Thymus aids differentiation of T cells. T cells are the type of lymphocyte that plays a central role in cell mediated immunity. T cells have a receptor on the cell surface.
6. Thymus, spleen, tonsils and adenoids produces _________
a) Phagocytes
b) Lymphocytes
c) Erythrocytes
d) Rhombocytes
View Answer
Explanation: Lymphocytes are type of white blood cells. They work to fight illness and disease. There are two types of Lymphocytes and they are B Lymphocytes and T Lymphocytes.
7. Which of the following is not a primary lymphoid tissue?
a) Thymus
b) Spleen
c) Bone marrow
d) Foetal liver
View Answer
Explanation: Spleen acts as a filter for blood as a part of immune system. Spleen is not a primary lymphoid tissue.
8. Which of these cell surface markers is unique to T cells?
a) CD3
b) CD15
c) CD45
d) CD83
View Answer
Explanation: CD3 T cell co receptor helps to activate cytotoxic T cell and also T helper cell. CD3 is unique to T cells.
9. The pineal gland secretes __________
a) MSH
b) Melatonin
c) Melanin
d) Prolactin
View Answer
Explanation: The pineal gland secretes Melatonin. It regulates sleep and wakefulness.
10. Which of the following is not an effect of pineal body secretion?
a) Inhibition of GnRH
b) Inhibition of reproductive functions
c) Help regulation of sleep cycle
d) Stimulation of appetite
View Answer
Explanation: Pineal body secretion does not show any effect of appetite. Mainly it secretes Melatonin.
11. Which of the following is true about melanin secretion?
a) More melatonin is secreted at night and day.
b) More melatonin is secreted at day
c) Melatonin can help regulate sleep cycles
d) Melatonin is secreted at noon
View Answer
Explanation: Melatonin is produced by various tissues in the body, although the major source is the pineal gland. The production and release of Melatonin occur with a clear daily rhythm with peak levels occurring at night.
12. Which of the following is not an endocrine gland?
a) Pituitary gland
b) Pineal gland
c) Sebaceous gland
d) Adrenal gland
View Answer
Explanation: Sebaceous gland is a small gland that secretes a lubricating oily matter into hair follicles to lubricate skin and hair. Sebaceous gland is not an endocrine gland.
13. Which is the common problem with the endocrine system?
a) Bad gas
b) Diabetes
c) Hemophilia
d) Lung cancer
View Answer
Explanation: Diabetes is a common problem with the endocrine system. It is due to too much sugar in the blood.
Sanfoundry Global Education & Learning Series – Human Anatomy and Physiology.
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