In a sarcomere, myosin makes up the __________ filaments.
Fill in the blank(s) with the appropriate word(s).
thick
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This figure shows an intestinal villus. What is the structure indicated by the number 1?
A. Intestinal artery B. Lacteal C. Microvillus D. Intestinal vein E. Flagellum
What compound binds to the AMPA receptors and NMDA receptors of the postsynaptic neuron?
a. glutamate b. dopamine c. serotonin d. norepinephrine e. adrenalin
Tetanus of a muscle is thought to be caused by
A. the rapid movement of Na+ back into the sarcoplasmic reticulum. B. high Ca2+ concentrations in the sarcoplasm. C. decreased amounts of Ca2+ in muscle tissue. D. increased temperature in the active muscle. E. an increase in stimulus strength.
The white crescent at the proximal end of the nail is called the ____
a. lunula b. root c. nail bed d. medulla