Physiology MCQs
Physiology MCQs help medical and dental students master body functions across cardiovascular, respiratory, renal, digestive, endocrine, and neurophysiology systems. Ideal for MDCAT, NTS, USMLE, and FCPS, these quizzes boost retention and exam success.
Q: The majority of carbon dioxide is transported in blood as
A) Carbaminohemoglobin
B) Dissolved gas
C) Carbonic acid
D) Bicarbonate
Q: Smooth muscle in blood vessels is primarily controlled by
A) Somatic nervous system
B) Sensory nerves
C) Central nervous system
D) Autonomic nervous system
Q: The hormone responsible for regulating circadian rhythms is
A) Melatonin
B) Cortisol
C) Insulin
D) Serotonin
Q: The refractory period ensures unidirectional propagation of
A) Blood flow
B) Hormone release
C) Muscle contraction
D) Action potential
Q: The fluid portion of blood without clotting factors is called
A) Lymph
B) Plasma
C) Interstitial fluid
D) Serum
Q: The adrenal medulla secretes hormones that act as
A) Sympathetic neurotransmitters
B) Growth inhibitors
C) Antioxidants
D) Digestive enzymes
Q: Aldosterone increases sodium reabsorption in the
A) Distal tubule
B) Loop of Henle
C) Proximal tubule
D) Collecting duct
Q: The hormone responsible for uterine contractions during labor is
A) Progesterone
B) FSH
C) Estrogen
D) Oxytocin
Q: The process of heat loss through direct contact is called
A) Evaporation
B) Radiation
C) Conduction
D) Convection
Q: The hormone that raises blood calcium levels is
A) Parathyroid hormone
B) Glucagon
C) Insulin
D) Calcitonin