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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?
Wiki User
∙ 15y ago
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.
Wiki User
∙ 15y ago
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What causes your right butt cheek to hurt?
Probably because you strained it whilst lifting something. See you Chiro or Physio and Explain to him you have lower back pain
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The pancreas
How does exercise cause skeletal tissue to become stronger?
Your skeleton responds to weight bearing exercises like jogging, weight lifting and so on. It responds by growing bigger bones. That gives the bones more strength and lets it with stand more pressure. The hyaline chief of the cartilage responds by going through a thickening process, that process automatically increases the protection of the joint interface. It also increases the synovial capitals strength. The response to the bone growth provides additional protection for the joints against the results of activity movements and pressure on them. The response is also useful because in later life it can reduce wear, tear and reduce the possibility of arthritis. The joint is improved by the ligament's strength and flexibility meaning that the joint can with stand more strength without dislocating.
Which muscles do the job of lifting?
Legs and back
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increases,the volume increases
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increases with speed
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Angle
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increases with speed
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Lifting weights increases the density of the bone which helps prevent osteoporosis.
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The lifting pressure is set by turning the adjusting nut on top of the valve.
What does weight lifting do for your muscles?
Weight lifting is the process of contracting your muscles with applied pressure. With enough pressure being pushed muscles will eventually grow.
What does what weight lifting do for your muscles?
Weight lifting is the process of contracting your muscles with applied pressure. With enough pressure being pushed muscles will eventually grow.
Can lifting weights cause constipation?
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What risks exist for Marfan syndrome patients when participating in some activities?
Weight lifting increases blood pressure, which in turn may enlarge the aorta. Rough physical contact may cause retinal detachment. Sudden changes in air pressure may produce pneumothorax.
The lifting force on an airplane's wing does which of the following?
increases with speed
What are the four types of atmospheric lifting mechanisms?
convergent lifting :low pressure area convectional lifting : local surface heating orgraphic lifting : physical barrier frontal lifting(cold and warm fronts) : contrasting air masses
