Which of the following is the correct order for the tissues of the digestive tract from external to internal?
A. Serosa, muscularis, submucosa, mucosa
B. Muscularis, mucosa, submucosa, serosa
C. Mucosa, submucosa, muscularis, serosa
D. Submucosa, mucosa, muscularis, serosa
Answer: A
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After encountering an antigen, an animal has memory cells that can produce antibodies quickly. In the absence of the antigen
A) Memory cells die off. B) Memory cells don't produce antibodies at all. C) Memory cells produce few antibodies. D) Memory cells are totally inactivated.
Describe the pathway by which sound waves are conducted in the outer, middle, and inner ear, and also how sound is transduced into neural stimuli. Include the following in your answer : cochlea, scala tympani, scala vestibule, scala media, organ of Corti, tympanic membrane, helicotrema, ear ossicles, oval window, round window, hair cells, and cochlear nerve
What will be an ideal response?
Which of the following acts as an ATPase during the contraction cycle of muscle?
A) actin molecules B) troponin molecules C) tropomyosin molecules D) the head portion of the myosin molecule E) the tail portion of the myosin molecule
Thyroxine is also known as
A. T4. B. T3. C. thymosin. D. thyrotropin.