How does the autonomic nervous system (ANS) contribute to homeostasis?
By controlling skeletal muscle contraction
By controlling voluntary muscle movements
By regulating involuntary body functions
By producing hormones
The Correct Answer is C
A. By controlling skeletal muscle contraction: Skeletal muscles are controlled by the somatic nervous system, not the autonomic nervous system, and are responsible for voluntary movements.
B. By controlling voluntary muscle movements: Voluntary muscle control is managed by the somatic nervous system, while the ANS operates involuntarily to maintain internal balance.
C. By regulating involuntary body functions: The ANS regulates involuntary activities such as heart rate, digestion, respiratory rate, and blood pressure, maintaining homeostasis without conscious effort.
D. By producing hormones: Hormone production is primarily the function of endocrine glands; the ANS influences some glands indirectly but does not produce hormones itself.
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Related Questions
Correct Answer is B
Explanation
A. Iron, Magnesium, Zinc, and Copper: These are trace elements present in very small amounts and do not contribute significantly to total body weight.
B. Carbon, Hydrogen, Nitrogen, and Oxygen: These four elements are the major components of biomolecules such as proteins, lipids, carbohydrates, and nucleic acids, making up more than 98% of the human body’s mass.
C. Sodium, Chlorine, Iodine, and Fluorine: These elements are essential electrolytes or trace elements but are present in relatively small quantities and do not account for the bulk of body weight.
D. Calcium, Phosphorus, Potassium, and Sulfur: While these elements are important for bone structure and metabolic functions, they contribute a smaller fraction of total body mass compared to C, H, N, and O.
Correct Answer is C
Explanation
A. Freely movable joints: Freely movable joints, such as synovial joints, allow a wide range of motion and are not characteristic of fibrous joints, which are mostly rigid.
B. Allow rotational movement: Rotational movement is typical of specific synovial joints like the pivot joint, not fibrous joints. Fibrous joints have very limited or no movement.
C. Immovable joints: Fibrous joints are connected by dense connective tissue and are largely immovable, providing stability and strength between bones, such as in the sutures of the skull.
D. Composed of cartilage: Joints composed of cartilage are classified as cartilaginous joints, not fibrous joints, which are made of dense fibrous connective tissue.
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