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How does vasoconstriction and vasodilation of blood vessels effect blood pressure?
No. Vasoconstriction is a squeezing of the veins. This is like putting your thumb at the end of a garden hose. The constriction of the flow increases the pressure. The water shoots out faster from the hose when your thumb is blocking the way. If the entire hose were to tighten, as in vasoconstriction, the same effect happens.--From Wikipedia: Vasoconstriction"Generalized vasoconstriction usually results in an increase in systemic blood pressure..."
How a nurse decrease preload of the heart?
Preload (the amount of blood that goes into the heart before it contract), is reduced by VASODILATION-->When you dilate veins, blood tends to pool in the veins, and tends to stay in the veins so it decreases the amount of blood returning to the heart, which decreases PRELOAD. Vasodilation is usually done with Nitroglycerin administration or morphine. But for hypertension the following meds also cause vasodilation, which decreases blood pressure... ACE inhibitors, which act on the angiotensin converting enzyme and prevent it from causes vasoconstriction; Certian calcium channel blockers; Alpha II agonists, which prevent the sympathetic system from releasing epinephrine and norephinephrine (two substances that usually cause vasoconstriction); Alpha I blockers, that act directly on the vessels to cause vasodilation These interventions all require a physicians orders obvioiusly. However the nitroglycerin is a "standing order" in most acute clincial situations, along with aspirin, oxygen therapy, and morphine. (Lippincott. 2008) Sandra Nettina: "The Lippincott Manual of Nursing Practice" @ 2008 Lippincott-Raven Publishers
How do capillaries help control body temperature?
Vasoconstriction And Vasodilation. Vasodilation is when its hot, so your capillaries widen and your veins come up to the surface of your skin to release heat. as well as your pores widening releasing beads of sweat. (When it evapourates it cools your body down) Vasoconstriction - when your veins and capillaries contract slighlty and dont stick up from your skin, to keep heat inside. As well as skin pours tightening, and your hair on your arms and stuff sticking up straight - to trap air in between to insulate your body. And if you start to shiver - its your muscles contracting and relaxing to produce heat energy.
What are the major factors that promote the flow of venous blood?
Factors are, skeletal muscle contraction, breathing movements and vasoconstriction of veins.[venoconstriction].
What nerves that carry impulses to regulate the diameter of arteries and veins are?
The nerves that carry impulses to regulate the diameter of arteries and veins are primarily the sympathetic nerves of the autonomic nervous system. These sympathetic fibers release neurotransmitters, such as norepinephrine, which can cause vasoconstriction or vasodilation, thereby controlling blood vessel diameter. Additionally, parasympathetic fibers, particularly those from the vagus nerve, can influence certain blood vessels, although their primary role is more associated with heart rate and digestion than direct regulation of vascular tone.
How blood pass through the veins?
what veins does it pass through
How much education is required to become a rock star?
All you need is the ability to let the music flow through your veins and into your soul...
What does the blood travel through?
arteries and veins
Do veins run through your muscles?
are you seriously asking this question? no veins are not muscles, they are veins
How do you write Irish blood runs through these veins?
Irish blood runs through these veins
How do mammals increase heat loss from their bodies?
Mammals lose heat because they are often warmer than their surroundings, it is a law of thermodynamics that heat flows from warm to cool.
What propels blood to the tissues?
Arterial pressure pushes blood through the body. Blood, as a heterogeneous mixture of cells, liquid, and other substances, is pushed through blood vessels via the pumping of the heart. It perfuses through the arteries, arterioles, capillaries, tissues, venules, veins, and back to the heart via the pressure of the blood through these blood vessels. At certain points along the way, pressure can increase or decrease, based on the diameter of the vessels through which it travels, as well as the presence or absence of any blockages. Vasoconstriction, vasodilation, and fluid balance help to maintain blood pressure accordingly.
