Question
The diagram shows the synaptic transmission of nerve impulsesby the neurotransmitter
acetylcholine.
What is the fate of acetylcholine immediately after binding to the receptor?
A. It is pumped into the postsynaptic neuron.
B. It diffuses into the presynaptic neuron.
C. It is broken down in the synaptic cleft.
D. It binds to another receptor in the postsynaptic neuron.
Answer/Explanation
Question
What is an example of negative feedback in the menstrual cycle?
A. High levels of estrogen inhibit FSH secretion.
B. High levels of LH stop progesterone secretion.
C. High levels of FSH delay ovulation.
D. High levels of progesterone make follicles less receptive to FSH.
Answer/Explanation
Question
Which labelled structure of the male reproductive system contributes to formation of semen?
Answer/Explanation
Question
The image show a neuron.
What is the function of X?
A. Increases the speed of transmission along the axon
B. Increases the rate of exchange of sodium and potassium ions
C. Holds bundles of neurons together to form a nerve
D. Determines the direction of the action potential