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If your blood vessels dilate whithout an increase in your heart rate, your blood pressure can drop dramatically. exercise stimulates your heart rate to increase and also hormones such as Nitros oxide (NO aka. Viagra) causes vasocontriction or the contracting of blood vessels so that blood pressure rises.
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What happens in the heart during Systole?
During systole the thick muscular walls of the ventricles contract. This happens to both sides of the heart at about the same time.The contraction of the ventricular muscle raises the pressure in the ventricle. The high pressure in the ventricle forces the bicuspid valve to close and forces blood up the aorta.
Why is gneiss hard?
Gneiss is metamorphic rock that forms from preexisting sedimentary or igneous rocks. It is developed under high temperature and pressure conditions, causing it to become hard.
Is blood pressure of 138 over 90 ok?
A diastolic pressure of 90 is a wee bit high. You should keep an eye on it, if it gets any higher, you should see your doctor.
Why do high mountain climates have variable conditions?
High mountain climates have variable conditions because of the extreme conditions such as strong winds and torrential rains.
Should you use hi beams in foggy conditions?
You should use dipped beams. Using high-beams simply reflects the light off the fog directly into your eyes, so causing dazzle.
What are normal values for blood pressure measurement?
Normal blood pressure levels are around 120 systolic and 70 diastolic. But the safe zone starts at 90 (low normal) up to 140 (high normal) on the systolic and 60 (low normal) up to 90 (borderline) with the diastolic. Much of it also depends on the individual and their height and weight as well.
How many seconds are in one cardiac cycle?
The cardiac cycle is the sequence of events that makes up one heartbeat: * Oxygenated blood enters the left atrium of the heart under high pressure from the pulmonary vein, and deoxyenated blood enters the right atrium of the heart under low pressure from the vena cava. * The atria gradually fill and become distended. As they fill up the pressure in the atria exceeds the pressure in the ventricles, and the tri and bicuspid valves are forced open and some blood enters the relaxed ventricles. This stage is called diastole. * The atria then contract, in a stage called atrial systole, and blood is forced into the ventricles. Almost immediately after atrial systole, (approximately 0.1 seconds after) ventricular systole takes place where the ventricles contract. The bi and tricuspid valves slam shut, and the first heart sound 'Lub' is heard. * As pressure in the ventricles exceeds pressure in the aorta and pulmonary artery, the semilunar valves are forced open, and blood enters these elastic walled vessels. * Ventricular diastole follows. Some blood will tend to return back into the ventricles, but this causes the semilunar valves to slam shut. The second heart sound 'Dub' is heard. * The repeated relaxing and recoiling of the elastic fibres in the walls of the arteries as a result of ventricular systole forces blood along the arteries in a series of pulses. * The further away from the heart the blood is the less pronounced the pulse. * This whole series of events takes, on average, 0.8 seconds.
Which conditions characterize a high pressure area?
high humidity
Why would a wire nut melt?
Moisture causing corrosion on the nutted wires causing a high resistance on the splice which in turn creates heat. Sometimes on conditions like this the wire insulation can melt back up to six inches. Close to the splice the insulation can actually get so brittle that it will fall off of the wire.
Where in the body would you find low oxygen levels causing vasocontriction and high levels causing vasodilation?
lungs
Alpine conditions high in mountains are similar to conditions in the tundra is it true or false?
true
What are the functions of the chordae tendineae and papillary muscle?
The chordae tendinae connect the bicuspid and tricuspid valves to the papillary muscles. the tendinae keep the valves shut during systole. During diastole, when the chambers fill with blood, the papillary muscles contract, pulling the tendinae, thus opening the valves.
