Final answer:
The two factors that influence blood pressure are contractility and cardiac output.
Step-by-step explanation:
The strength of the heart contraction and blood volume are two factors that influence blood pressure.
Contractility refers to the force of the contraction of the heart muscle, which controls stroke volume (SV). When the heart contracts with greater strength, the stroke volume increases, leading to an increase in blood pressure. Conversely, when the heart contracts with less force, the stroke volume decreases and blood pressure decreases.
Cardiac output is another factor that influences blood pressure. It is the measurement of blood flow from the heart through the ventricles and is dependent on heart rate and stroke volume. When either heart rate or stroke volume increases, cardiac output increases, resulting in an increase in blood pressure.