Why is lactose intolerance so common?
What will be an ideal response?
Answer: Historically, in most parts of the world, milk as not available as a food for adults (only for nursing infants). Therefore, in most parts of the world, humans evolved to not express the lactase gene after approximately the age of two.
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A __________ is a procedure where a temporary opening is made in the trachea to allow airflow when the upper airway is obstructed.
Fill in the blank(s) with the appropriate word(s).
Placing pure water around cells causes the cells to swell because the cytosol has a lower osmotic pressure than the pure water
Indicate whether the statement is true or false
When a neurotransmitter causes the opening of chemically gated potassium channels on the postsynaptic cell, the postsynaptic potential that results is an
A. EPSP, which is a depolarization.
B. EPSP, which is a hyperpolarization
C. IPSP, which is a depolarization.
D. IPSP, which is a hyperpolarization.
The sensation of taste is carried on axons of the following cranial nerve(s): ________
A) V B) VII, IX, and X C) I D) III, IV, and VI