Sound waves entering the external acoustic meatus (auditory canal) hit the eardrum, also known as the ________
A) tympanic membrane
B) pinna
C) auricle
D) oval window
E) ossicles
A
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Graded potentials
A) produce an effect that increases with distance from the point of stimulation. B) produce an effect that spreads actively across the membrane surface without diminishing. C) may be either a depolarization or a hyperpolarization. D) are often all-or-none. E) always cause repolarization.
What are the chemical messengers for the nervous system?
a. hormones released into the blood b. hormones released into the synaptic cleft c. hormones released in the spinal canal d. neurotransmitters released into the synaptic cleft e. neurotransmitters released into the blood
What is an example of a Type I hypersensitivity reaction?
A) ABO incompatibility B) autoimmune disorder C) contact dermatitis D) hay fever
Which of the two lungs is larger and wider?
A. The left lung B. The right lung