What is the main function of the vertebral column?
To connect the upper and lower limbs
To protect the heart and lungs
To support the body and protect the spinal cord
To protect the brain
The Correct Answer is C
A. To connect the upper and lower limbs: While the vertebral column provides attachment points for muscles and limbs, its primary role is not connecting the limbs directly.
B. To protect the heart and lungs: Protection of the heart and lungs is mainly provided by the thoracic cage, not the vertebral column.
C. To support the body and protect the spinal cord: The vertebral column provides structural support, maintains posture, and encases the spinal cord within the vertebral canal, safeguarding it from injury while allowing flexibility.
D. To protect the brain: The brain is protected by the skull; the vertebral column protects only the spinal cord, which is continuous with the brain.
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Correct Answer is D
Explanation
A. To protect the brain: The brain is protected by the skull, which is a part of the axial skeleton. The pelvic girdle is located in the lower body and has no role in cranial protection. Its function is primarily structural and supportive rather than protective of the head.
B. To facilitate breathing: Breathing is supported by the diaphragm and ribcage, which expand and contract to allow air movement. The pelvic girdle does not contribute to respiratory mechanics but serves as a base for muscular attachment.
C. To connect the shoulder to the axial skeleton: The shoulder connects to the axial skeleton via the pectoral (shoulder) girdle, not the pelvic girdle. The pelvic girdle instead connects the lower limbs to the axial skeleton, providing stability for weight-bearing.
D. To support the weight of the upper body: The pelvic girdle bears the weight of the upper body and distributes it to the lower limbs. It also provides attachment points for muscles that aid in posture, locomotion, and movement, while supporting internal organs in the pelvic region.
Correct Answer is C
Explanation
A. Through direct neural connections: The hypothalamus communicates with the posterior pituitary via neural connections, not the anterior pituitary, which relies on hormonal signaling.
B. Through the secretion of melatonin: Melatonin is produced by the pineal gland and does not mediate communication between the hypothalamus and anterior pituitary.
C. Through releasing and inhibiting hormones via the hypophyseal portal system: The hypothalamus secretes specific releasing and inhibiting hormones into the hypophyseal portal blood vessels, which carry them directly to the anterior pituitary to regulate hormone production and release.
D. Through the secretion of insulin: Insulin is secreted by the pancreas and does not play a role in hypothalamic communication with the anterior pituitary.
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