Match the following terms with the correct definition.

the contractile unit of a muscle cell - sarcomere

contains calcium that is released during a contraction- Sarcoplasmic reticulum

composed of a contractile protein,actin, and two regulatory proteins, troponin and tropomyosin - thin myofilament

Is composed of the contractile protein myosin- thick myofilament

the muscle cell membrane- Sarcolemma

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

b) the inside picture would look at a very high temperature in a very low ph