Circulatory System

The heat pumps and sends the blood to different parts of the body. The heart beating looks like the pump.

r atrium r ventricle pulomanry artery lung capillaries pulmonary vein l atrium l ventricle aorta

To find your answer, your first step is to divide the time (in this case a minute...a minute equals sixty (60) seconds) by the heart rate (e.g. 80 beats). So---60 divided by 80 will give you 0.75 seconds. Your answer will justify the time/length of the cardiac cycle.

• fishes - 2 chambered heart with sinus venosus and conus arteriosis
• human - 4 chambered heart

There is a group of cells in the heart called the "pacemaker" that sends out a nerve shock to initiate a heartbeat. It also changes the pulse depending on certain external conditions to maintain homeostasis.

-Richard

by suking it

The semilunar valves control the flow of blood from the heart. The aortic semilunar valve controls the flow of blood from the left ventricle to the aorta, and the pulmonary semilunar valve controls the flow of blood from the right ventricle to the pulmonary artery.
Pulmonary valve

Aortic arch to descending thoracic aorta to abdominal aorta to celiac trunk to splenic artery

there really isn't any such thing as an ischaemic artery (it can happen, but I've never heard of it!). Rather ischemia (or ischaemia for our English and Australian friends) is a lack of sufficient oxygen delivery to a tissue. Oxygen is carried by HEMoglobin in the blood hence the iscHEMia. Ischemia is usually caused by an interruption to the blood flow to a particular area. One way to interrupt blood flow is to block an artery. (which usually deliver oxygenated blood to tissues) A blockage may be the result of a plaque (a fatty aggregation on the inside walls of an artery), or a thombus (clot), or an embolus of some sort. People often hear that they may have ischemic heart disease. This is a condition of severely narrowed arteries (often greater than 70% of their cross sectional area may be blocked) which leads to decreased blood (and hence oxygen) supply to the muscle of the heart. This can cause Angina. If the coronary arteries completely block off, then a heart attack will ensue, where cardiac muscle dies because of lack of oxygen. Treatment ranges from medications to: lower cholesterol, decrease oxygen consumption of the heart, vasodilators to increase delivery of blood through that artery; to surgery to operate and either re-open the blocked vessel (balloon angioplasty and stenting ) or procedures to essentially replace the diseased vessels in By-pass surgery (CABG- coronary artery bypass grafting). Hopefully that helps!! Aj :)

The pulmonary circulation is the portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated blood back to the heart while for the systemic circulation, it is the portion of the cardiovascular system which carries oxygenated blood away from the heart, to the body, and returns deoxygenated blood back to the heart... :D

visceral pericardium

The receiving chambers are the atria (singular atrium). The right atrium receives deoxygenated blood from the body, and the left atrium receives oxygenated blood from the lungs.

The right atria receives blood from the veins (systemic).

The left atria receives blood from the lungs (pulmonary).

Yes, the heart and lungs are superior to the organs of the abdomen in that they are located above those organs.

The heart and blood vessels are part of the cardiovascular system. Cardio- or cardiac refer to the heart. Vascular refers to the blood vessels. Circulation or circulatory refers to the movement of blood through the vascular system.

With a double circulatory system, the heart can increase the pressure of the blood after the blood has picked up oxygen from the lungs. This means it can transport oxygen to the body tissues much quicker.

Left Ventricle to Left side of brain via common carotid Left Ventricle Aortic (semi-lunar) valve Ascending aorta Aortic arch Left common carotid artery Left carotid sinus Left internal carotid artery Left anterior cerebral artery

Four main blood vessels enter/exit the heart: two veins and two arteries. Oxygenated blood enters the left ventricle through the pulmonary vein. This same blood is then pumped out of the left atrium via the aorta. Meanwhile, de-oxygenated blood enters the heart in the vena cava; before leaving through the pulmonary artery.

The membranes from superficial to deep are:

A sac-like structure called pericardium. It is comprised of two parts - the outer fibrous pericardium and an inner double-layered membrane itself made up of parietal and visceral pericardium.

No your blood is not red until it hits oxygen, that is why your veins are not red.

The above answer is incorrect. All blood is red but blood with oxygen is brighter red and blood lower in oxygen is darker red. All veins do not carry blood low in oxygen. Most do but not ones coming to the heart from the lungs.

An abnormal heart murmur may have an enlarged heart compared to one without

Arteries, the largest of which is the Aorta. Arteries then split down into smaller blood vessels called arterioles and then smaller still into one-cell-thick vessels known as capillaries. These capillaries are where diffusion, movement of Oxygen from the blood vessels into the nearby tissue cells, occurs.

It is important to keep your circulatory system working at its best. Your heart pumps blood to every part of your body. It travels through thousands of miles of blood vessels! Blood carries oxygen from your lungs. If there is a problem with your blood, your heart, or your blood vessels, your whole body can suffer. If you don't get enough oxygen to your brain, you might not be able to think clearly. If your stomach isn't getting enough oxygen, it might be hard for you to digest your food. If there is a problem with one of your blood vessels, blood could stop flowing to a part of your body. Without it, those cells could die.

2 What can you do to keep your circulatory system healthy? You can make sure that you are getting plenty of exercise. When you exercise, you heart beats faster. This makes your heart stronger. Your heart is a muscle. Just like the muscles in your arms and legs, your heart gets bigger and stronger the more that you use it. Exercise also helps to keep your blood vessels working properly. Go outside and play! Ride your bicycle. Go for a swim. Your body will thank you!

3 Eat healthy foods. They will keep your circulatory system healthy. Iron-rich foods like beans, whole-grain breads and cereals, red meat, and green vegetables are good for your blood. Try to avoid fatty foods, especially fried foods and foods that contain a type of fat called trans fat. Eating too much fat can cause fat