Nokea
What is the main function of the nervous system?
- A. Transporting blood
- B. Protecting the body from infection
- C. Regulating body temperature
- D. Digesting food
Correct Answer: C
Rationale: The main function of the nervous system is to control and coordinate body activities by transmitting signals between different parts of the body and responding to internal and external stimuli. This allows for the regulation of body temperature, movement, sensory perception, and various other functions necessary for homeostasis. Choices A, B, and D are incorrect as they do not align with the primary role of the nervous system. Transporting blood is mainly carried out by the circulatory system, protecting the body from infection is a function of the immune system, and digesting food is the role of the digestive system.
You may also like to solve these questions
What is the function of the large intestine in the digestive system?
- A. To secrete digestive enzymes
- B. To absorb water and form solid waste
- C. To produce bile
- D. To transport nutrients
Correct Answer: B
Rationale: The large intestine's primary function is to absorb water from the remaining indigestible food matter that enters it from the small intestine. This absorption process helps in forming solid waste (feces) by compacting the material and preparing it for excretion. The large intestine does not secrete digestive enzymes, produce bile, or transport nutrients. Therefore, option B, 'To absorb water and form solid waste,' is the correct function of the large intestine in the digestive system.
Which muscle is responsible for the extension of the elbow?
- A. Biceps brachii
- B. Triceps brachii
- C. Deltoid
- D. Pectoralis major
Correct Answer: B
Rationale: The correct answer is B: Triceps brachii. The triceps brachii muscle is responsible for extending the elbow joint. It is located on the back of the upper arm and acts in opposition to the biceps brachii, which is responsible for elbow flexion. The deltoid muscle is primarily responsible for shoulder abduction, not elbow extension. The pectoralis major muscle is involved in movements of the shoulder joint, not the elbow.
Which vitamin is essential for the synthesis of collagen?
- A. Vitamin C
- B. Vitamin D
- C. Vitamin B12
- D. Vitamin K
Correct Answer: A
Rationale: The correct answer is Vitamin C. Vitamin C is essential for the synthesis of collagen, a protein crucial for maintaining the structure and integrity of skin, blood vessels, and bones. It plays a key role in the hydroxylation of proline and lysine residues in collagen synthesis, which is necessary for the stability and strength of collagen fibers.
Choice B: Vitamin D is essential for bone health and calcium absorption but is not directly involved in collagen synthesis.
Choice C: Vitamin B12 is important for red blood cell formation and neurological function but is not directly related to collagen synthesis.
Choice D: Vitamin K is necessary for blood clotting and bone metabolism but does not play a direct role in collagen synthesis.
Which vitamin is necessary for blood clotting?
- A. Vitamin D
- B. Vitamin K
- C. Vitamin C
- D. Vitamin B12
Correct Answer: B
Rationale: Vitamin K is essential for the synthesis of proteins involved in blood clotting. These proteins help in the coagulation process, ensuring that wounds can heal properly by preventing excessive bleeding. Without sufficient Vitamin K, the blood clotting process may be impaired, leading to potential health risks. Vitamin D is important for bone health, Vitamin C is essential for the immune system and collagen production, and Vitamin B12 plays a role in red blood cell production and nerve function, but they are not directly involved in the blood clotting process.
What is the primary function of the kidneys in the urinary system?
- A. Regulating blood pressure
- B. Filtering blood to remove waste
- C. Producing red blood cells
- D. Regulating electrolyte balance
Correct Answer: B
Rationale: The primary function of the kidneys in the urinary system is to filter blood to remove waste products and excess fluids, which are then excreted as urine. Kidneys act as a filtration system, removing waste like urea, excess salts, and toxins. While the kidneys do play a role in regulating blood pressure by secreting renin and maintaining electrolyte balance by adjusting the levels of sodium, potassium, and other ions in the blood, their main and essential function is filtration and waste removal, making choice B the correct answer.