In which of the following tissues would low oxygen levels cause vasoconstriction?
A. Skeletal muscle
B. Heart
C. Brain
D. Lungs
Answer: D. Lungs
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When a cell is dividing, the genetic material is in the compact form of __________
Fill in the blank with correct word.
Hypercapnia
a. refers to excess CO2 in the arterial blood b. occurs when CO2 is blown off to the atmosphere at a rate faster than it is being produced by the tissues c. may be caused by hypoventilation d. would likely result in a higher percent saturation of oxygen on Hb e. would tend to raise the blood's pH
Which statement accurately compares the transmission speed of the different types of synapses?
A. Transmission at electrical synapses involves a brief synaptic delay, but chemical synapses are faster. B. Transmission at chemical synapses involves a brief synaptic delay, but electrical synapses are faster. C. Electrical synapses have a constant delay of 1 millisecond, but chemical synaptic delays vary between 0.1 and 0.3 millisecond. D. Transmission at both chemical and electrical synapses involves a synaptic delay of approximately 1 millisecond.
All of the following are typical characteristics of neurotransmitters exceptÂ
A. they alter the physiology of the postsynaptic cell. B. they bind to specific receptors on the postsynaptic cell. C. they are synthesized by a presynaptic neuron. D. they are released in response to stimulation. E. they are released into the bloodstream before reaching the postsynaptic cell.