A cholinergic agonist will cause the pyloric sphincter to relax, leading to increased gastric emptying. This is because cholinergic stimulation promotes smooth muscle relaxation in the gastrointestinal tract, allowing food to pass through the pyloric sphincter more easily.
A sphincter is basically a hatch keeping stuff in and other stuff out of an organ such as the stomach. The pylorus is the muscle keeping the exit of the stomach shut, or opening it so that half-digested food may enter the duodenum to be digested further. The muscle ensures food can stay in the stomach long enough, and not flow right on through without being modified long enough by the stomach acids and digestive enzymes. It also regulates the amount of stuff that goes through.
The narrowing of the digestive tract in some areas, such as the pyloric sphincter in the stomach and the small intestine, helps to regulate the flow of food and digestive juices through the system. These narrowed areas also play a role in controlling the movement of food, facilitating digestion and absorption of nutrients.
I assume you mean "Why do veins in the head and face lack valves?"The answer is due to being organisms with upright posture. You need valves in your legs to keep the blood from falling down to your feet, and instead propel the blood to your heart. Your head, though, is above your heart, so you don't want valves trapping the blood in the head. That would cause headaches and perfusion issues. So lacking valves allows blood to flow down to the heart.
Stomata and guard cells are called turgor-operated valves because their opening and closing are regulated by changes in turgor pressure within the guard cells. When the guard cells become turgid from water uptake, they bow outwards and cause the stomatal pore to open. Conversely, when the guard cells lose water and become flaccid, the pore closes.
The cardiac sphincter is located at the top of the stomach and controls the direction of food passing through the esophagus so that no food will re enter the esophagus. The Pyloric sphincter stops bile and digested food from entering the stomach, this valve is located at the bottom of the stomach.
The lower esophageal sphincter. Actually it is triggered to relax by the nervous system as part of the swallowing reflex so the question is a bit overly simplistic if not just wrong.
Open so the ventricle can receive more blood to pump.
A cholinergic agonist will cause the pyloric sphincter to relax, leading to increased gastric emptying. This is because cholinergic stimulation promotes smooth muscle relaxation in the gastrointestinal tract, allowing food to pass through the pyloric sphincter more easily.
You can get a heart valve surgery to fix that. You can also avoid eating oily food that can clog up the valves. By not doing so, you are at risk of heart attacks.
i dont know wat the answer is so find it out yourself
It can if the pistons hit the valves while they are open. The timing chain ensures that when the piston is at the op of it's storke the valves are closed. When the chain breaks the cam stops turning allowing the valves to open and close so if the piston is still trying to travel up in the cyclinder with the valves open it will hit them and bend or break them. Also trying to start the engine with the timing change broken can have the exact same result.
There is a short time between the exhaust and intake stroke where all the valves are slightly open at the same time. This period of time is called valve overlap. This is because the intake valves are just starting to open as the exhaust valves are just finishing closing. This is done so flow through the engine can be maintained at engine operating speeds.
Valves prevent blood from going backward.Valves in general open to allow or close to prevent liquid flow. Heart valves opens to let blood into the heart then close to keep it there so that when the heart muscle contracts and squeezes the blood it is then forced out into the arteries of the body.
When the atria contract, there is increase in pressure in the atrial chambers. So both bicuspid and tricuspid valves opened up. When both the ventricles contract, both the bicuspid and tricuspid valves get closed. This opens up the aortic and pulmonary valves.
they open to allow the blood through then close again so the blood can't flow back
can the valves be adjusted on the 454 7.4 engine