Nokea
What is the maximum volume of air that can be expelled from the lungs after maximum inhalation?
- A. Tidal volume
- B. Total lung capacity
- C. Ventilation rate
- D. Vital capacity
Correct Answer: D
Rationale: The correct answer is D, Vital capacity. Vital capacity represents the maximum volume of air that can be expelled from the lungs after a maximum inhalation. Tidal volume (Choice A) is the volume of air inspired or expired during normal breathing at rest and is not the maximum capacity. Total lung capacity (Choice B) refers to the maximum volume of air the lungs can accommodate including the residual volume, not just the expelled air. Ventilation rate (Choice C) is the rate at which air is moved in and out of the lungs, not the maximum volume of air that can be expelled.
You may also like to solve these questions
DNA has both a 'sense' and 'antisense' strand. What is true about the antisense strand?
- A. It runs 5' to 3'.
- B. It runs 3' to 5'.
- C. It is used in replication.
- D. It is the direction DNA is stored.
Correct Answer: B
Rationale: The correct answer is B: 'It runs 3' to 5'. The antisense strand runs in the 3' to 5' direction, complementing the sense strand. Choice A is incorrect as the antisense strand runs in the opposite direction, which is 3' to 5'. Choice C is incorrect because the antisense strand is not directly involved in replication. Choice D is incorrect as the direction DNA is stored is not determined by the antisense strand.
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.
Which part of the neuron receives signals from other neurons?
- A. Axon
- B. Dendrite
- C. Synapse
- D. Myelin sheath
Correct Answer: B
Rationale: The correct answer is B, Dendrite. Dendrites are the part of the neuron that receive signals from other neurons and transmit them to the cell body. Axons transmit signals away from the cell body, synapse is the junction between neurons where neurotransmitters are released, and myelin sheath is a fatty layer that insulates and speeds up signal conduction along the axon. Therefore, choices A, C, and D are incorrect in the context of receiving signals from other neurons.
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 hormones regulates calcium levels in the blood?
- A. Insulin
- B. Parathyroid hormone
- C. Thyroid hormone
- D. Glucagon
Correct Answer: B
Rationale: The correct answer is B, Parathyroid hormone. Parathyroid hormone plays a crucial role in regulating calcium levels in the blood by increasing calcium levels when they are too low. This hormone acts on the bones, kidneys, and intestines to ensure proper calcium balance in the body. Insulin (choice A) is involved in glucose metabolism, not calcium regulation. Thyroid hormone (choice C) primarily regulates metabolism, and while it indirectly influences calcium levels, it is not the primary regulator. Glucagon (choice D) is involved in increasing blood glucose levels, not calcium regulation.