NEET Human Physiology 1 — Questions and Answers
Question 1: What is the normal pH of human blood?
- 6.8–7.0
- 7.35–7.45 (Correct answer)
- 7.0–7.2
- 7.5–7.8
Correct answer: 7.35–7.45
Normal human blood pH ranges from 7.35 to 7.45; deviations cause acidosis or alkalosis, disrupting metabolic processes.
Question 2: Which part of the brain regulates body temperature, hunger, and thirst?
- Thalamus
- Hypothalamus (Correct answer)
- Pituitary gland
- Amygdala
Correct answer: Hypothalamus
The hypothalamus is the master regulator of homeostasis, controlling body temperature, hunger, thirst, and circadian rhythms.
Question 3: How many chambers does the human heart have?
- 2
- 3
- 4 (Correct answer)
- 5
Correct answer: 4
The human heart has four chambers: two upper atria (left and right) and two lower ventricles (left and right).
Question 4: Which part of the neuron transmits nerve impulses away from the cell body?
- Dendrite
- Myelin sheath
- Axon (Correct answer)
- Nucleus
Correct answer: Axon
The axon carries nerve impulses (action potentials) away from the neuron's cell body toward the axon terminals.
Question 5: What is the approximate total lung capacity in a healthy adult?
- 1–2 liters
- 3–4 liters
- 6 liters (Correct answer)
- 10 liters
Correct answer: 6 liters
The total lung capacity of a healthy adult is approximately 6 liters, consisting of tidal volume, reserve volumes, and residual volume.
Question 6: What is the resting membrane potential of a typical neuron?
- +70 mV
- 0 mV
- -70 mV (Correct answer)
- -40 mV
Correct answer: -70 mV
The resting membrane potential of a neuron is approximately -70 mV, maintained by Na+/K+ ATPase pumps and ion channel permeability.
NEET Human Physiology 1
What is the normal pH of human blood?