Human Anatomy Mcqs on “Ductless Glands – Thymus, Pineal Body, Chromophil and Cortical Systems”.
1. The Thymus is located in __________
A. Neck
B. Along intestinal walls
C. Along trachea
D. In abdominal cavity above diaphragm
View Answer
Answer: C
Clarification: The Thymus is located along the trachea behind the sternum. It is located between lungs.
2. Thymus secrets ____________
A. Thymosin
B. Macrophages
C. Antibodies
D. Lymph
View Answer
Answer: A
Clarification: Thymus secrets Thymosin. It stimulates the development of disease fighting Tcells.
3. Thymus is smaller in children than in adults.
A. True
B. False
Answer: B
Clarification: After puberty thymus starts to slowly shrink. It becomes replaced by fat.
4. T lymphocytes mature in ____________
A. Spleen
B. Thymus
C. Red bone marrow
D. Thyroid
Answer: B
Clarification: T lymphocytes play a central role in cell mediated immunity, it has a receptor on the cell surface. T lymphocytes mature in Thymus.
5. Endocrine gland thought to be involved in setting the biological clock and influencing the reproductive function of ___________
A. Pituitary gland
B. Thymus gland
C. Adrenal gland
D. Pineal gland
Answer: D
Clarification: Pineal gland is the small endocrine gland. It secrets the hormone that affects the modulation of sleep/wake patterns and photoperiodic functions.
6. Pineal gland of human brain secretes melatonin concerned with ________
A. Anger
B. Body temperature
C. Smell
D. Coloration of the skin
View Answer
Answer: D
Clarification: Melatonin is a hormone secreted by Pineal gland. It is also known as N-acetyl-5-methoxy tryptamine.
7. The pineal gland secrets _____________
A. Melatonin
B. Vasopressin
C. MSH
D. Prolactin
View Answer
Answer: A
Clarification: The pineal gland secrets Melatonin. It regulates sleep and wakefulness. Melatonin supplement is used to treat jet lags or sleep problems.
8. Where is Pineal gland located?
A. Just below Adam’s apple
B. Hanging down from hypothalamus
C. Between the right and left hemisphere of the brain
D. In the frontal lobe of brain
Answer: C
Clarification: Pineal gland is located in the epithalamus near the centre of the brain between the two hemisphere tucked in a groove where the two halves of the thalamus join. The function of this gland was discovered last.
9. Changes in blood concentration of glucose, oxygen and hydrogen ions are detected by __________
A. Baroreceptors
B. Chemoreceptors
C. Nociceptors
D. Proprioceptors
View Answer
Answer: B
Clarification: Chemoreceptors are stimulated by a change in concentration of chemicals such as glucose, oxygen, carbon dioxide and hydrogen ions.
10. Which of these receptors detects stretching or lengthening of a muscle?
A. Nociceptors
B. Muscle spindle
C. Golgi tendon organ
D. Meissner’s coruscle
Answer: B
Clarification: Muscle spindle and Golgi tendon organs both transmit proprioceptive information. The muscle spindles are located within muscles while Golgi tendon organs are located within the tendons.
11. The sensation of temperature, touch, pressure and pain occurs in ___________
A. Temporal lobe
B. Occipital lobe
C. Parietal lobe
D. Frontal lobe
Answer: C
Clarification: The sensation of temperature, touch, pressure and pain occur in postcentral gyrus of each parietal lobe. The Parietal lobe contains primary somatic sensory cortex. The thalamus projects general somatic sensory information to this part of the cerebrum.
12. The occipital lobe contains which of the following primary sensory areas?
A. Visual
B. Taste
C. Auditory
D. Olfactory
Answer: A
Clarification: The cerebrum is divided into lobes. The visual cortex where the visual images are processed is located in occipital lobe.
13. Which of the following is an effect of aging on the nervous system?
A. Reduction in the number of free nerve ending
B. Decreased awareness of tactile stimulation
C. Identify objects by touch more easily
D. An increases sense of two pint discrimination
Answer: B
Clarification: As one age, free nerve endings and hair follicle receptors largely remain unchanged, however pacinian corpuscles and Meissner’s corpuscles decrease in number and become structurally distorted, thus elderly have a decreased awareness of tactile and pressure stimulation.