Physiology One-liner
Contraction of skeletal muscle is initiated by —
Acetylcholine
The primary pacemaker of the heart —
SA node
Hemoglobin's oxygen affinity increases in —
Low temperature
Gas exchange in the lungs takes place at —
Alveoli
The resting membrane potential of a typical neuron is about —
−70 mV
Parathyroid hormone increases blood calcium levels by —
Stimulating bone resorption
Cardiac output is the product of —
Stroke volume and heart rate
The primary function of the loop of Henle —
Water reabsorption
An action potential is propagated due to —
Ion channel activation
The main site of nutrient absorption in the GI tract —
Small intestine
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