Proteins serve as antibodies.
Answer:These contractile elements are virtually identical to skeletal muscle. ... (a) Cardiac muscle cells have myofibrils composed of myofilaments arranged in sarcomeres, ... The refractory period is very long to prevent the possibility of tetany, a ... At this point, the calcium ion channels close and K+ channels open, allowing outflux ..
Explanation:
The answer would be, "Thylakoids"
Carbohydrate digestion begins in the mouth with the secretion of saliva but most occurs in the duodenum as a result of the secretion of
secretin.
The gourth one best supports
