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If Passive stretching exerted by blood on the muscle of the ventricle at the end of diastole is?
Passive stretching of the ventricular muscle during diastole, primarily influenced by the volume of blood filling the heart, leads to an increase in myocardial fiber length. This phenomenon, known as the Frank-Starling mechanism, enhances the force of contraction during systole, allowing the heart to pump more effectively. The greater the ventricular filling (preload), the more the muscle fibers stretch, resulting in stronger contractions to accommodate the increased blood volume. This intrinsic property helps the heart maintain efficient circulation in response to varying blood return.
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What is preload?
the pressure exerted on the wall of the ventricle before being filled up.
The pressure exerted by the left ventricle must push blood where?
The pressure exerted by the left ventricle pushes oxygenated blood out of the heart and into the systemic circulation, supplying oxygen and nutrients to the body's tissues and organs.
Which term refers to the force exerted as the heart pumps blood from the left ventricle to the arteries and out into the body?
systole
What is the difference between passive and active tension in muscle contraction?
Passive tension is the force exerted on a muscle when it is stretched, while active tension is the force generated by the muscle when it contracts.
What is a stretching or pulling force?
A stretching force, also known as tension, is a force that elongates or stretches an object. A pulling force is a force exerted on an object to move it towards the direction of the force. Both forces involve pulling or stretching an object.
What name is given to the stretching force that occurs in a spring or rope being pulled?
The name given to the stretching force that occurs in a spring or rope being pulled is tension. It is a pulling force exerted by the material when it is stretched or pulled.
What force would be exerted by stretching or compressing elastic materials?
The force exerted by stretching or compressing elastic materials is known as the restoring force. This force is proportional to the amount of deformation applied to the material. As the material is stretched or compressed, the restoring force acts in the opposite direction to bring the material back to its original shape when the deformation is released.
What causes the tricuspid valve to open?
The chordae tendenae prevents the back flow
What event within the heart causes the AV valves to open?
The AV valves open when the blood pressure exerted on their atrial side is greater then on the ventricle side. This happens when blood returning to the heart fills the atria and puts pressure against the valve. Note : When heart is completely relaxed, the AV valve flaps hang limply into the ventricle chamber (open) allowing blood from the atria to flow through them directly to the ventricle. Thus, it is the result of ventricle contraction which closes the AV valves and moves them from their resting state (open).
Which term is a pulling force exerted by solids?
The term for a pulling force exerted by solids is tension. Tension is created when an object is pulled or stretched apart, causing the material to experience internal forces that try to resist the stretching.
What do the two number in the blood pressure mean?
Blood pressure is pressure exerted by blood on the walls of blood vessels. The two numbers represent the systolic and diastolic pressure. Systolic pressure is the pressure exerted during ventricular contraction(also called systole) and diastolic pressure is the pressure exerted during ventricular relaxation(also called diastole). The units of blood pressure are millimeters of Mercury (mmHg) because it represents how far up a tube the pressure can push a column of mercury, which was how pressure used to be measured.
What is the pressure wave in arteries produced when the left ventricle contracts called?
"Blood pressure" is the pressure exerted by the blood against the walls of the arteries, maintained by the contraction of the left ventricle, the resistance of the arterioles and capillaries, the elasticity of the arterial walls, and by the viscosity and volume of the blood.
