BIO 203 Exam 2 Purdue Questions and Answers 2025

you are barefoot on the beach, and your left foot comes into contact with a sharp, painful object. Immediately, you withdraw your foot. What reflex helps to prevent you from falling down? -Correct Answer crossed extensor structure that is part of the brain's endogenous analgesic system -Correct Answer periaqueductal gray you are carrying out an experiment where you deliver stimuli of increasing voltage to a whole muscle. you observe a twitch when the stimulus is 0.23 volts. what would happen if you stimulate with 0.45 volts? -Correct Answer force of contraction would increase which of the following statements is wrong? a. axonal sprouting only occurs if the cell body of the neuron is undamaged b. neurotrophic factors are proteins c. Schwann cells inhibit axonal regeneration d. "grid" and "place" neurons constitute the brain's GPS system -Correct Answer c. Schwann cells inhibit axonal regeneration these neurons generate an internal representation of an action - whether you are actually carrying it out, anticipating carrying it out, or watching somebody else carry it out. -Correct Answer mirror; canonical you would lose proprioception if you cut the -Correct Answer dorsal columns in the "knee-jerk" reflex, there is ----- of the neurons controlling ipsilateral flexor muscles -Correct Answer reciprocal inhibition suppose the biceps brachii is attached to the radius at a distance of 7cm from the elbow joint and suppose the hand moves 15cm in response to a 3cm shortening of the biceps brachii. What is the distance from the fulcrum of the elbow joint to the hand? -Correct Answer 35 15/3=5 5x7=35 glial cells that have properties similar to macrophages -Correct Answer microglia a 34-year old man presents with paralysis affecting one side of his tongue. which of the following cranial nerves is likely to be damaged? -Correct Answer XII what does glutamic acid do? -Correct Answer opens sodium channels curare paralyzes by -Correct Answer binding to acetylcholine receptors which of the following statements is wrong? a. satellite cells are important in muscular hyperplasia b. work done by a muscle is proportional to the force x distance shortened c. skeletal muscle typically atrophies when exposed to testosterone d. muscular hypertrophy increases the cross-sectional area of a muscle -Correct Answer c. skeletal muscle typically atrophies when exposed to testosterone