I wpupd say D but im not sure
Stroke Volume
Heart Rate
Cardiac Output
Systolic
Diastolic
Volume and Pressure of Blood Cells
Enzymes are regulated by more than the binding of small molecules. A second method that is used all the time by eucaryotic cells to regulate a protein's function is the covalent addition of a phosphate group to one of its amino acid side chains. These phosphorylation events can affect the protein in two important ways.
Hydrogen bond. Although other ones are equally as important such as a dipole-induced dipole
