The basic contractile unit of a skeletal muscle is the:
a. sarcomere
b. actin
c. myosin
d. Z-lines
a. sarcomere
Anatomy & Physiology
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A muscle fiber exposed to a series of stimuli of increasing frequency combines individual twitches (summation) which results in
A. a latent period. B. complete sustained contraction. C. muscle tone. D. flaccid muscles.
Anatomy & Physiology
Memory B cells remember pathogens
Indicate whether the statement is true or false.
Anatomy & Physiology
Antigens are foreign substances recognized by _____.
A) macrophages B) T cells C) B cells D) all of these
Anatomy & Physiology
Each complex in the electron transport chain collectively acts as a _____ pump that removes H+ from the mitochondrial matrix and pumps it into the space between the inner and outer mitochondrial membranes
A. proton B. electron C. neutron D. sodium-potassium E. calcium
Anatomy & Physiology