MCAT BIO 4
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what is sarcoplasmic reticulum?
modified ER that stores calcium ions in muscle cells
during contraction what happens to A band, H zone and I band?
no change in A band, H zone and I band decrease in length
role of calcium in initiation of sarcomere contraction
Ca binds with troponin, causing confromational shift in tropomyosin, exposing the myosin binding sites
which nervous system inhibits digestion, which promotes it
sympathetic inhibits, parasympathetic promotes
(t/f) blood entering pulmonary capillaries has higher partial pressure of O2 than the air in the alveoli
how does the partial pressure of CO2 in capillary compare with the partial pressure of CO2 in alveolar.
capillary has higher partial pressure
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