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Well it's a bit more complicated. What you should know is that local mediators are more important for coronary blood flow then nerve stimulation. So in this case it's as follows: Adrenaline causes the heart to increase the heart-rhythm. Increased rhythm causes increases oxygen need for heart cells. So local mediators causes the coronaries to dilate. To sum up, adrenaline will theoretically cause coronary constriction but in practise it will cause dilation (due the increased heart activity)
For acetylcholine it's the same (in the end it causes coronaries to constrict due to the decreased heart activity)
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Why are artery walls thick?
Arteries are blood vessels that transport blood, nutrients and OXYGEN to the body. All these substances have to get transported which is why they have more pressure to be forced to different body parts. Oxygen for example contains a lot of pressure. This supports the reason of the walls to be thick so that all the pressure does not cut or damage the arteries!
How is blood intrinsically controlled?
Blood flow is intrinsically controlled by the ability of local tissues to constrict or dilate arterioles that serve them. This alters the region flow depending on the body's needs. There are three types of intrinsic control: metabolic, myogenic, and endothelial.
How are arteries related to blood pressure?
Because arteries have to do with giving blood to body parts and blood pressure has to do with the amount of blood you have and the arteries have a huge part in that!!! Thank you arteries are the carriers of oygenated blood to the body . blood pressue is very high. the walls are made of elstic material which can either contract or dilate due to pressure changes. blood pressure levels can be influenced by exercise ie when muscles are in motion and temperature changes
Why do veins have less collagen elastic fibers and smooth muscles than arteries?
Because blood in veins is under lower pressure than in arteries, so they do not need as many collagen fibres. In addition, as veins already have a wide diameter, they do not need to dilate that much hence they also dont contract that much (as opposed to artieries), so they have less elastic recoil, thus they have less elastic fibres. :)
What nervous system controls heart rate?
The Brain but also the Heart This is why a heart can continue to beat even after it is cut out of the body. Tachycardia sufferers have a problem with the heart beating extremely rapidly. this can now be treated by lazering the part of the heart that causes the excessive heart rate The sinoatrial node (S-A node) or pacemaker
Does adrenaline constrict pupils of the eyes?
dilates them
Why does the veins constrict and dilate during exercise?
Almost all the veins and arteries constrict and dilate during heavy exercise. Even capillaries bring a flush to the face and skin by dilation.
How does arteries function?
The arteries carry oxygenated blood from the heart to the body. The walls of arteries are muscular allowing the arteries to constrict or dilate. The more constricted the arteries are, the higher the blood pressure.
What is a heart cath?
This is the guided set of wire and tube that you pass through your radial artery or the femoral artery to the opening of the coronary arteries to inject the dye to see the coronary arteries. You can dilate the narrow coronary arteries as well as put the stent there.
What does the term elastic mean pertaining to arteries?
The term Elastic Arteries usually refers to the ability of blood vessels to dilate and constrict freely.
How does the artery function?
The arteries carry oxygenated blood from the heart to the body. The walls of arteries are muscular allowing the arteries to constrict or dilate. The more constricted the arteries are, the higher the blood pressure.
What is the opposite of constrict?
dilate
Can fear cause pupils to constrict?
It causes them to dilate not constrict.
What vessels cant constrict and dilate?
Capillaries
What is it called when a person's pupils no longer dilate from the light?
Pupils don't dilate from light, the constrict. They dilate in the dark, to take in more light, and constrict in the light so your eyes don't get damaged. Hallucinogenics, stimulants and alcohol and make your pupils dilate and opiates and diazepam can make them constrict. Im not sure what that's called though..
What is selective redistribution of blood?
Selective redistribution of blood is an important factor in increasing performance during physical activity arteries dilate and constrict during this process
What medications are administered before atherectomy is performed?
At the beginning of the procedure, medications to control blood pressure, dilate the coronary arteries, and prevent blood clots are administered
