it separates the inside of the cell from the environment outside and it controls substances moving in and out of the cell (selectively permeable)
 
        
             
        
        
        
Answer:
the rhythm of heart contractions.
Explanation:
In Human anatomy, cardiac cycle can be defined as a complete heartbeat of the human heart which comprises of sequential alternating contraction and relaxation of the atria and ventricles, therefore causing blood to flow unidirectionally (one direction) throughout the human body.
Generally, the cardiac cycle occurs in two (2) stages;
1. Diastole : in this stage, the ventricles is relaxed and would be filled with blood.
2. Systole: at this stage, the muscles contracts and thus, allow blood to be pushed through the atria.
An electrocardiogram (ECG) provides information about the rhythm of heart contractions.
Additionally, the right atrioventricular valve (AV) also referred to as the tricuspid valve is located on the right dorsal side of the human heart. The right atrioventricular valve (AV) comprises of three (3) leaflets (flaps) which opens and closes in order to allow for the flow of blood from the right atrium of the human heart to the right ventricle. Also, the right atrioventricular valve is saddled with the responsibility of preventing blood from flowing backward in the mammalian heart.
 
        
             
        
        
        
No, her height is within normal range, and her pituitary gland is working normally.
<h3>Why is the pituitary gland called the master gland?</h3>
The pituitary gland is occasionally called the "master" gland of the endocrine system because it maintains the functions of many of the other endocrine glands. 
The pituitary gland is no larger than a pea and is found at the base of the brain.
Thus, her height is within normal range, and her pituitary gland is working normally.
To learn more about the pituitary gland click here:
brainly.com/question/4133041
 
        
             
        
        
        
It seems that you have missed the necessary options for us to answer this question. But anyway, here is the answer. Based upon w<span>hat we are learning about the lion fish diet, what most likely is going </span> to happen to caribbean coral reefs invaded by lion fish is that t<span>here will be fewer algae-eating fish. More algae will grow over and damage corals. Hope this helps.</span>