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What controls the opening and closing of the clam valves?
The adductor muscles control the opening and closing of the clam valves. When these muscles contract, the valves close, and when they relax, the valves open. Clams use this mechanism to protect themselves from predators and regulate their internal environment.
How does the crocodile stop water getting in its ears and nose when it dives?
vanpirs can turn in to 27 diffrent animals
How many valves are in a sheep's heart?
There are 2 valves in a sheep's heart. They are the mitral and tricuspid valve. The sheep also has a 4 chamber heart that is very similar to a human heart.
How many valves does a bivalve have?
A bivalve typically has two valves or shells that are hinged together. These shells provide protection and support for the soft body inside.
What is Common Types of Valves?
There are a few different designs: Parallel disk gate valves use two disks with a spring in between them, sliding into the seats. At low pressure, the spring forces the disks outward against the seats, sealing off the valve. At high pressure, all the sealing is accomplished by the downstream disk. Wedge gate valves use a tapered disk that slides into two seats set at a slight, converging angle. The wedging action provides the sealing force between the disk and the seat. Single disk gate valves are used where the flow is always one way (like sluices on dams). There is some flexibility in the attachment of the disk to the stem, so the differential pressure on the disk pushes it against the seat, sealing it off.
Why does a giraffe need special valves in the blood vessels that can close when it is getting a drink?
The blood pressure in the giraffe's body is very high so that blood pumps to the head but when it lowers the head to drink the pressure would be extreme and it would die with out the valves.
What impact does the C.fetus subtype of the Campylobacter bacteria have on vessels and heart valves?
Infection of vessels and heart valves is a special characteristic of C. fetus.
Do capilliaries have valves?
Capillaries do not have valves. Veins are the blood vessels with valves.
Name blood vessels that contain valves?
Valves are in the veins.
Why would you stop getting erections at the age of 58?
The valves in the blood vessels which control penis erection quit working with age.
How many valves are there in artery?
Arteries are valve-less vessels, meaning there are no valves.
Do both arterial and venous vessels have valves?
No, only venous vessels have valves. Valves in veins help prevent the backflow of blood and aid in promoting blood flow back to the heart. Arterial vessels do not have valves because blood in arteries is under higher pressure and flows away from the heart.
Are valves found in all vessels?
passive
What blood vessels contain valves and why?
Only veins contain valves. The valves prevent the backward flow of blood.
What does Doppler echocardiography do?
Doppler echocardiography employs a special microphone that allows technicians to measure and analyze the direction and speed of blood flow through blood vessels and heart valves
What vessels transport blood toward the the heart and have valves?
veins
What type of blood vessels have values?
Veins have valves, arteries don't.
