In the skeletal system, what is the role of the pelvic girdle?
To protect the brain
To facilitate breathing
To connect the shoulder to the axial skeleton
To support the weight of the upper body
The Correct Answer is D
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.
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Related Questions
Correct Answer is C
Explanation
A. Larynx: The larynx houses the vocal cords and contributes to airway protection and sound production. While it moves upward during swallowing to help partially close the airway, it does not directly block food from entering the trachea; the epiglottis is the main structure that performs this protective function.
B. Bronchi: The bronchi are the main airways that branch from the trachea into the lungs. They do not actively prevent food from entering the airway during swallowing. If food reaches the bronchi, it indicates aspiration, which can lead to serious respiratory complications.
C. Epiglottis: The epiglottis is a leaf-shaped flap of cartilage that covers the trachea during swallowing. It directs food and liquids into the esophagus, preventing them from entering the respiratory tract. This protective mechanism is crucial for preventing choking and aspiration pneumonia.
D. Diaphragm: The diaphragm is a primary muscle of respiration, creating negative pressure to allow inhalation. It does not participate in swallowing or airway protection, and it does not prevent food or liquids from entering the trachea.
Correct Answer is D
Explanation
A. Producing red blood cells: Red blood cells are produced in the bone marrow, not the lymphatic system, which focuses on fluid balance and immunity.
B. Transporting oxygen to tissues: Oxygen transport is carried out by red blood cells in the circulatory system, not the lymphatic system.
C. Regulating body temperature: Thermoregulation is primarily controlled by the hypothalamus and blood flow adjustments, not the lymphatic system.
D. Absorbing dietary fats from the intestines: The lymphatic system absorbs fats and fat-soluble vitamins from the digestive tract via lacteals, transporting them to the bloodstream, which is a key function alongside immune defense.
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