Which of the following is not true of acetylcholine?
A) It binds to receptor membrane channels.
B) It diffuses across the synaptic cleft.
C) It is stored in the neuron in vesicles.
D) It enters the muscle fiber to release calcium form the sarcoplasmic reticulum.
E) It is digested by acetylcholinesterase.
D
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Blood platelets
A) all of the above. B) form from megakaryocytes. C) release serotonin. D) number from 150,000 - 450,000 per microliter blood.
What is the term for the mobile end of muscle attached to a bone?
A. Head C. Insertion D. Origin
Which is avascular (lacks blood vessels)?
A. Nervous tissue B. Muscle tissue C. Connective tissue D. Epithelial tissue E. All of the choices are correct.
The thoracic cavity is situated superior to the abdominopelvic cavity and separated by the diaphragm. Therefore, the diaphragm creates a:
A) parasagittal plane. B) transverse (horizontal) plane, or cross section. C) midsagittal (median) plane. D) frontal (coronal) plane.