The refractory period is.. i. an increase in the electrical gradient across a membrane ii. a period when the neuron is insensitive to depolarization iii. a decrease in the electrical gradient across a membrane a. ii only b. i and ii only c. i only d. i, ii, and iii e. iii only

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

In the presence of oxygen, glycolysis is followed a. the krebs cycle b. lactic acid fermentation c. alcoholic fermentation d. photosynthesis

What happens during the experiment stage of the scientific method