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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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Where is a pericardial friction rub best heard?
A pericardial friction rub is best heard at the lower left sternal border, usually in the region of the apex of the heart. It is a high-pitched, scratchy sound that can be heard during both systole and diastole. It is typically a sign of pericarditis.
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.
What accounts for the flow of blood in arteries?
The flow of blood in arteries is primarily driven by the pumping action of the heart, which generates high pressure during ventricular contraction (systole). This pressure forces blood into the arterial system, causing it to flow away from the heart. Additionally, the elasticity of arterial walls helps to maintain blood pressure and propel blood forward during diastole, when the heart relaxes. The combination of these factors ensures a continuous and regulated flow of blood throughout the body.
What experimental conditions resulted in denature enzymes?
Denaturation of enzymes can occur under extreme conditions such as high temperatures, extremes of pH, or exposure to certain chemicals or detergents. These conditions disrupt the enzyme's structure, causing it to lose its shape and function.
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 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.
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.
Area of high pressure where air moves apart and sinks?
This is known as an anticyclone. In an anticyclone, the air descends, causing high pressure at the surface. The sinking air diverges at the surface, creating stable and clear weather conditions.
What type of nuclear burst occurs under?
A thermonuclear burst occurs under conditions of extremely high temperature and pressure, causing the fusion of atomic nuclei and resulting in a powerful release of energy.
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.
What are the effects of high temperature and pressure on the behavior of materials?
High temperature and pressure can alter the behavior of materials by causing changes in their physical and chemical properties. At high temperatures, materials may soften, melt, or even vaporize, while high pressure can compress materials, making them denser or causing them to undergo phase transitions. These conditions can also affect the strength, conductivity, and other characteristics of materials, leading to potential changes in their mechanical, electrical, or thermal properties.
