Q91. What is the main function of the ligaments in the human body?
A) To connect muscles to bones
B) To connect bones to bones
C) To cushion joints
D) To protect organs
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Correct Answer: B) To connect bones to bones
Explanation: Ligaments are strong bands of fibrous connective tissue that connect bones to other bones at joints, providing stability and guiding joint movement.
Q92. Which vitamin is important for the formation of blood cells and the health of the nervous system?
A) Vitamin A
B) Vitamin B12
C) Vitamin C
D) Vitamin D
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Correct Answer: B) Vitamin B12
Explanation: Vitamin B12 is essential for the formation of red blood cells and the maintenance of a healthy nervous system. It is also involved in DNA synthesis and regulation.
Q93. What is the primary function of the bronchi in the respiratory system?
A) To exchange gases
B) To warm and moisten the air
C) To transport air to and from the lungs
D) To absorb oxygen
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Correct Answer: C) To transport air to and from the lungs
Explanation: The bronchi are two main branches that lead from the trachea to the lungs, providing a passageway for air to enter and exit the lungs.
Q94. Which part of the human body is responsible for the production of estrogen?
A) Adrenal glands
B) Pancreas
C) Ovaries
D) Testes
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Correct Answer: C) Ovaries
Explanation: The ovaries produce estrogen, a hormone that plays a key role in the development of female secondary sexual characteristics and the regulation of the menstrual cycle.
Q95. What is the primary function of the intervertebral discs in the human spine?
A) To produce red blood cells
B) To protect the spinal cord
C) To act as shock absorbers
D) To facilitate movement
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Correct Answer: C) To act as shock absorbers
Explanation: The intervertebral discs are located between the vertebrae in the spine and act as shock absorbers, cushioning the bones as the body moves.
Q96. Which hormone is responsible for stimulating uterine contractions during childbirth?
A) Estrogen
B) Progesterone
C) Oxytocin
D) Prolactin
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Correct Answer: C) Oxytocin
Explanation: Oxytocin is a hormone that stimulates the uterus to contract during childbirth and also triggers milk ejection during breastfeeding.
Q97. What is the primary function of the macula in the eye?
A) To control pupil size
B) To produce tears
C) To provide central vision
D) To protect the retina
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Correct Answer: C) To provide central vision
Explanation: The macula is a small area in the center of the retina that provides sharp, clear, straight-ahead vision.
Q98. Which part of the human body is responsible for the production of digestive enzymes and hormones such as insulin and glucagon?
A) Liver
B) Gallbladder
C) Pancreas
D) Stomach
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Correct Answer: C) Pancreas
Explanation: The pancreas produces digestive enzymes that help break down food in the small intestine, as well as hormones like insulin and glucagon that regulate blood sugar levels.
Q99. What is the primary function of the capillaries in the circulatory system?
A) To pump blood
B) To carry blood away from the heart
C) To exchange gases, nutrients, and waste products
D) To return blood to the heart
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Correct Answer: C) To exchange gases, nutrients, and waste products
Explanation: Capillaries are the smallest blood vessels in the body and their primary function is to facilitate the exchange of oxygen, carbon dioxide, nutrients, and waste products between the blood and the tissues.
Q100. Which vitamin is essential for the proper functioning of the immune system and the synthesis of collagen?
A) Vitamin A
B) Vitamin B6
C) Vitamin C
D) Vitamin E
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Correct Answer: C) Vitamin C
Explanation: Vitamin C is essential for the proper functioning of the immune system and is also a key component in the synthesis of collagen, which is important for wound healing and the maintenance of healthy skin, blood vessels, bones, and cartilage.