Which of the following statements about prostaglandins is true?
A. Thromboxane A2 induces vasodilation.
B. Prostaglandins inhibit inflammation.
C. Prostaglandin synthesis is blocked by the actions of caffeine.
D. Prostaglandins may contribute to asthma.
Answer: D
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Substances larger than ________ are normally not allowed to pass through the filtration membrane
A) sodium ions B) glucose C) albumin D) amino acids E) urea
Which of the following are unencapsulated tactile receptors that are in direct contact with the epidermis and respond to sensory neurons at swollen synapses called tactile discs?
A) tactile corpuscles B) root-hair plexuses C) Merkel cells D) Meissner's corpuscles
An action potential
A. has no repolarization phase. B. is an example of negative feedback. C. propagates across the plasma membrane in a decremental fashion. D. cannot transmit information. E. occurs when the local potential reaches threshold level.
Organisms that thrive in the extreme cold are known as
A) Psychrotrophs. B) Cryomorphs. C) Mesotrophs. D) Picnomorphs.