Structures that allow for one-way blood flow through the heart.

The heart is primarily made of a thick muscle layer, called the myocardium, surrounded by membranes. One-way valves separate the four chambers. After blood passes through the pulmonary arteries, the right semi lunar valves close preventing the blood from flowing backwards into the right ventricle.

mammal

explanation:

the cells uses some of the atoms of the glucose molecules to atp molecules. the atoms of the glucose molecules will then be converted into energy which will be eventually stored in atp. the energy produced which are stored in atp are coming from the glucose’s chemical bonds.