Which of the following fetal shunts connects the umbilical vein with the inferior vena cava?
A. Foramen ovale
B. Umbilical vein
C. Ductus venosus
D. Umbilical artery
E. Ductus arteriosus
Answer: C
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Which type of wave predominates during stage 4 NREM sleep?
A) delta B) alpha C) beta D) theta
Mast cells are ________
a. are transformed monocytes b. are a subset of B-cells c. a subset of T-cells d. are macrophages that remain in the circulation e. are analogous to sensing-integrating endocrine glands.
A substance is found to have the same effect as acetylcholinesterase, but acts at a much faster rate. What effect would this substance have at a cholinergic synapse?
A. It would greatly reduce synaptic communication by depleting ACh levels in the synaptic cleft. B. It would enhance synaptic communication by increasing the post-synaptic cells' sensitivity to ACh. C. It reduce synaptic communication by destroying ACh receptors on the post-synaptic membrane. D. It would enhance synaptic communication by concentrating ACh in the synaptic cleft.
Glycine and GABA act as inhibitory neurotransmitters in the CNS because they bind to Cl- channels on the postsynaptic membrane.
Answer the following statement true (T) or false (F)