QuestionSBA
QuestionChoice
The tendency for a tissue to distort under pressure is known as the tissue's compliance:

Compliance (C) = Change in volume (mL) / Change in pressure (mmHg)
10001946
e
Veins have an increased tendency to distort under pressure
QuestionChoice
This is explained by the Frank-Starling Law, which states that as the heart fills up with more blood in diastole, it contracts and pumps out more blood during systole.
10001943
b
Stroke volume increases as end-diastolic volume increases
QuestionChoice
This is explained by the cardiac length-tension relationship, which states that cardiac muscle length is proportional to the force produced.
10001944
c
The force of cardiac muscle contraction depends on the number of myosin-actin bridges formed
QuestionChoice
This is explained through the equation for Mean Arterial Pressure (MAP).

Mean Arterial Pressure (MAP) = Cardiac Output (CO) x Peripheral Vascular Resistance (PVR)
10001945
d
Cardiac output is inversely proportional to peripheral vascular resistance
QuestionChoice
The Law of LaPlace is a law in physics that states that the wall tension of a cylinder is proportional to the pressure of its contents and the radius of the cylinder:

Wall tension = pressure x radius

Arteries are like cylinders - therefore, the wall tension in arteries is dependent on the pressure of the blood flowing through it, and the radius.

This law explains why the left ventricle thickens in patients that have decreased cardiac output. The radius of a cylinder is inversely proportional to the pressure in the cylinder. This means the ventricle radius needs to decrease to maintain the same pressure through the cardiovascular system.
10001942
a
Left Ventricular Hypertrophy
Concept
Chapter
2693
3992
Law of LaPlace
Topic
134
Cardiology
12935
Which phenomenon can the law of LaPlace explain in terms of cardiac mechanics?
a