Nokea
What is the main function of the nervous system?
- A. To fight infection
- B. To control body movement and coordination
- C. To regulate metabolism
- D. To transport oxygen
Correct Answer: B
Rationale: The main function of the nervous system is to control body movement and coordination by transmitting signals between different parts of the body. Choice A is incorrect because the immune system, not the nervous system, is primarily responsible for fighting infections. Choice C is incorrect as regulating metabolism is primarily handled by the endocrine system. Choice D is incorrect because the transportation of oxygen is mainly the function of the circulatory system, specifically the blood.
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Which neuromuscular system controls voluntary movement?
- A. Autonomic
- B. Somatic
- C. Sympathetic
- D. Parasympathetic
Correct Answer: B
Rationale: The correct answer is B, Somatic. The somatic nervous system controls voluntary movements of skeletal muscles. It is responsible for carrying sensory and motor information to and from the central nervous system. Choices A, C, and D are incorrect. The autonomic nervous system (choice A) controls involuntary functions such as heart rate and digestion. The sympathetic (choice C) and parasympathetic (choice D) nervous systems are subdivisions of the autonomic nervous system and are responsible for the body's fight-or-flight response and rest-and-digest functions, respectively.
Which part of the heart receives oxygenated blood from the lungs?
- A. Left atrium
- B. Right atrium
- C. Left ventricle
- D. Right ventricle
Correct Answer: A
Rationale: The correct answer is A, the left atrium. The left atrium receives oxygenated blood from the lungs, which is then pumped into the left ventricle and out to the rest of the body. The right atrium receives deoxygenated blood from the body and sends it to the right ventricle to be pumped to the lungs for oxygenation. Choices B, C, and D are incorrect as they do not directly receive oxygenated blood from the lungs.
Which of the following bones is part of the axial skeleton?
- A. Femur
- B. Humerus
- C. Skull
- D. Pelvis
Correct Answer: C
Rationale: The correct answer is C: Skull. The axial skeleton consists of bones along the body's central axis, including the skull, vertebral column, ribs, and sternum. Choices A, B, and D are incorrect because the femur, humerus, and pelvis are part of the appendicular skeleton, which comprises the bones of the limbs and girdles.
What is the role of the large intestine in the digestive system?
- A. To break down proteins
- B. To absorb water and form feces
- C. To digest fats
- D. To neutralize stomach acid
Correct Answer: B
Rationale: The correct answer is B. The large intestine plays a crucial role in absorbing water from indigestible food matter and forming feces for elimination. Choice A is incorrect because the breakdown of proteins primarily occurs in the stomach and small intestine. Choice C is incorrect as the digestion of fats primarily occurs in the small intestine. Choice D is incorrect as neutralizing stomach acid is mainly the function of the stomach lining and not the large intestine.
Which type of muscle is responsible for moving the skeleton?
- A. Cardiac muscle
- B. Skeletal muscle
- C. Smooth muscle
- D. Voluntary muscle
Correct Answer: B
Rationale: Skeletal muscle is the correct answer as it is responsible for moving the skeleton. Skeletal muscles are under voluntary control, meaning they can be consciously controlled by the individual. Cardiac muscle (Choice A) is found in the heart and is responsible for pumping blood, not moving the skeleton. Smooth muscle (Choice C) is found in internal organs and is responsible for involuntary movements like digestion. Voluntary muscle (Choice D) is not a specific type of muscle; it refers to muscles that can be consciously controlled, which includes skeletal muscles.