Answer:
Calcium.
Explanation:
Muscle cells are the important for the body as they are involved in the bodily movement. Three different type of muscle are smooth muscle, cardiac muscle and skeletal muscle.
The sarcoplasmic reticulum contains the stored calcium in the muscle cell. The calcium is important ion that plays an important role in the muscle contraction. The actin and myosin protein functioning also depends on the the calcium ion.
Thus, the correct answer is option (B).
Answer: Yes, activities like aerobics help to have a healthy heart and that is why I like to do them.
Explanation: The exercises not only help the physical appearance but also health. A healthy heart is vital so that a person can live his daily life in a normal way and without any type of problems. In my case, I like to do aerobics or some type of cardio since these exercises help to maintain a young heart. Remember that these activities must be accompanied by a good diet.
D
..........................................................................................................................................................................................................................................................................................
Knowing how to easily manipulate the people around you. Not exactly a good thing though.
