The ________ is a complex structure produces by the epithelium and cells of the underlying connective tissue.
What will be an ideal response?
basal lamina
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Discuss the functions of the paranasal sinuses. Which bones contain paranasal sinuses?
What will be an ideal response?
Also known as the pneumotaxic center, this area allows for smooth transitions between inspiration and expiration.
A. Dorsal respiratory group B. Ventral respiratory group C. Medullary respiratory center D. Carotid body E. Pontine respiratory center
Tetrodotoxin (TTX) is generally associated with pufferfish, which in fact gain it from symbiotic bacteria residing in them. Interestingly, the pufferfish themselves aren't affected by this neurotoxin. The most plausible explanation for the fish's insensitivity to TTX is
a. the fish lack neurons. b. the fish have neurons, but with very short axons that enable them to rely entirely on electrical conduction based on local passive current flow. c. the fish lack voltage-gated sodium channels . d. the fish have voltage-gated sodium channels, but they have a slightly different sequence from voltage-gated sodium channels found in other organisms, and this difference affects TTX's ability to bind the channel.
What is true about somatic reflexes?
A) They help prepare the body for "fight-or-flight." B) We are not usually aware of them. C) They activate skeletal muscle. D) They are important in regulating digestion and blood pressure.