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the amount of pressure built up in the lungs during inhalation which causes a vaccum affect.
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When a person strains to lift a heavy object intrathoracic pressure increases What do you think will happen to the rate of venous blood returning to the heart during such lifting?
The Output (ml/min) of the Left Ventricle increases proportionally (approx.) to the Filling Pressure (that is, the pressure with which the blood returns to the heart), measured with respect to Intrathoracic Pressure. An increase in the latter will then produce a decrease in Cardiac Output, so the rate of blood returning to the heart decreases. That is in the short term. But just after the increase in intrathoracic pressure, the Baroreceptors in the thorax sense the drop in pressure difference and trigger a reflex to increase Heart Rate, in order to restore blood flow. So if the lifting is prolongated, the rate of blood returning to the heart finally comes back to normal level. The opposite reaction is produced when you inhale deeply and hold your breath.
Can you describe 'veins in neck bulging'?
Veins bulging in the neck can be described as extremely prominent veins in the neck area. Bulging veins in the neck may be indicative of raised intrathoracic pressure.
What is osmorgulation definition?
I'm pretty sure it has nothing to do with orgasms. Try spelling it "osmoregulation". For that, Wikipedia says: Osmoregulation is the active regulation of the osmotic pressure of an organism's fluids to maintain the homeostasis of the organism's water content; that is, it keeps the organism's fluids from becoming too diluted or too concentrated. Osmotic pressure is a measure of the tendency of water to move into one solution from another by osmosis. The higher the osmotic pressure of a solution, the more water tends to move into the solution. Pressure must be exerted on the hypertonic side of a selectively permeable membrane to prevent diffusion of water by osmosis from the side containing pure water.
The pressure that is exerted on the inside of cell walls and that is caused by the movement of water into the cell?
Osmotic pressure across the cell wall, here called Turgor Pressure.
What is blood pressure used to evaluate?
Your systole and diastole (or systolic and diastolic pressure). Systolic pressure is the pressure your blood exerts on blood vessels when your heart pumps out blood while diastolic pressure is the pressure your blood exerts on blood vessels when your heart is at rest(in between pumps). Blood pressure is stated as systolic pressure/diastolic pressure. The normal BP is 120/80 mmHg.
What is intrathoracic pressure?
Intrathoracic pressure is the pressure inside of the pleural cavity. It is also called intrapleural pressure and the normal pressure is called negative pressure.
What is the intrathoracic pressure?
Negative intrathoracic pressure is the normal pressure in the area between the pleura of the lungs and the chest wall. The pressure is considered negative because it is less than the atmospheric pressure.
What happens when relaxation of the diaphragm and intercostal muscles increases intrapulmonic and intrathoracic pressure?
Exhalation describes the state when the diaphragm relaxes and intrapulmonic and intrathoracic pressure increases.
What pressure keeps lungs inflated?
Intrathoracic pressure
What is the effect of respiration on the heart sounds?
during inspiration, intrathoracic pressure is decreased.
How does positive-pressure ventilation affect cardiac output?
It increases intrathoracic pressure which decreases venous return to the heart and causes a decrease in cardiac output.
How does positive pressure ventilation affect cardiac output?
It increases intrathoracic pressure which decreases venous return to the heart and causes a decrease in cardiac output.
What effect does opening the valve have on the left lung?
This simulates a punctured wall of the thoracic cavity, the intrathoracic pressure will equalize with atmospheric pressure so that the lung cannot be inflated.
When a person strains to lift a heavy object intrathoracic pressure increases What do you think will happen to the rate of venous blood returning to the heart during such lifting?
The Output (ml/min) of the Left Ventricle increases proportionally (approx.) to the Filling Pressure (that is, the pressure with which the blood returns to the heart), measured with respect to Intrathoracic Pressure. An increase in the latter will then produce a decrease in Cardiac Output, so the rate of blood returning to the heart decreases. That is in the short term. But just after the increase in intrathoracic pressure, the Baroreceptors in the thorax sense the drop in pressure difference and trigger a reflex to increase Heart Rate, in order to restore blood flow. So if the lifting is prolongated, the rate of blood returning to the heart finally comes back to normal level. The opposite reaction is produced when you inhale deeply and hold your breath.
Can you describe 'veins in neck bulging'?
Veins bulging in the neck can be described as extremely prominent veins in the neck area. Bulging veins in the neck may be indicative of raised intrathoracic pressure.
Why is it important that intrathoracic pressure be kept lower than atmospheric pressure?
subatmospheric pressure to be specific. pulmonary capillaries need such condition to promote flitration. Filtration is one of the main processes by which fluid moves between plasma and interstitium( exchange of gases and nutrients between blood and tissues
Why pause between inspiration and expiration in bronchial breathing?
inspiration is an active process that takes place by creation of negative intrathoracic pressure, in normal states where breathing is vesicular, even at a low negative pressure air keep on flowing into alveoli but in bronchial breathing as alveoli are either filled with secretions as in consolidation or a cavity is already filled with air and other contents, no movement of air takes place at the end inspiration despite of negative intrathoracic pressure thereby causing a pause between inspiration and expiration- now pay me thousand dollar!
