Calcium - it helps with bone development
Answer:
The correct statement is that Cardiac muscles have shorter absolute refractory period than skeletal muscles.
Explanation:
"Cardiac muscle also called heart muscle or myocardium is one of three types of vertebrate muscles, It is an involuntary, striated muscle that constitutes the main tissue of the walls of the heart."
Antigens are any molecules that elicit adaptive immune response. Antigens protrude from pathogens or other intruding substances. Antibodies are proteins found in blood plasma that attach to one particular kind of antigen and help to counter its effects.