Heart

The main thing that happens is that the heart would not be able to pump blood efficiently to all parts of the body, as a result of which all parts of the body would receive lesser and lesser oxygen. This can cause:

* Nausea * Vomiting

* Prolonged lack of oxygen may cause fainting As the oxygen supply continues to keep dwindling, the blood & oxygen supply to vital organs only will be maintained and supply to all other parts would be shut down. This is to ensure that the vital organs like the brain, heart etc continue to receive what little oxygen that is available to ensure life.

After some point of time, people would faint and then continue lack of oxygen may even cause death within hours...

Deoxygenated blood spilld into the right atrium by way of the inferior and superior vena cava. The blood then funnels through the tricuspid valve and builds up in the right ventricle. With a strong contraction upward, the right ventricle pumps the blood upward through the pulmonic valve(pulmonary semilunar valve) . The blood moves through the pulmonary artery to the lungs where the exchange of carbon dioxide for oxygen takes place. Oxygenated blood then flows from the lungs into the pulmonary veins. The pulmonary veins then dumps the oxygenated blood into the left atrium. Blood funnels through the mitral valve (bicuspid valve) into the left ventricle. A powerful contraction is made to push the blood through the aortic valve(aortic semilunar valve) into the aorta where the blood is channeled throughout the body.

The heart has two sides which are independent of each other. When it pumps, it pumps both on the left and right sides. The left carries blood throughout all the body tissues, and the right side pushes blood into the lungs for oxygenation.

When something frightens you(blanket term for frightening or stressful things being a "stressor"), your body reacts to the stressor to prepare your body to fight or run away from the problem. This is where the term Fight or Flight comes from.

The hypothalamus sends an electrical impulse down your nerves to your adrenal glands, which sit on top of your kidneys. These produce adrenaline and send it into your bloodstream. Adrenaline can cause: your breathing to speed up; your pupils to dilate; saliva production to slow down or stop; blood to drain away from non-critical organs like skin and stomach; decreased sensitivity to pain; and your heart rate to speed up. This is an evolved process to help us escape or neutralise dangerous situations.

It is ablood vessel that yransports oxygenated blood from the left ventricle to the aorta.

If I am not wrong the lower two chambers of the heart are called as ventricles i.e. left ventricle and right ventricle while the upper two chambers of the heart are called as atria( plural of atrium) i.e. left atrium and right atrium.

60-100 is the normal heart rate for an adult, but it varies per person. If your heart rate is normally around 90, a heart rate of 60 is going to be abnormally low. Also, many factors can cause a change in your heart rate, such as a change in body temperature, pain, exercise, nervousness, etc.

"I am not sure of names but i know that many cells make up the heart! Try to look on the Internet for your answer.

Hope this helped a bit :)"

You got to be kidding me... that wasn't helpful at all, but whatever.

In the heart you can find:

- Myocardiocytes - those are the cells performing the rhytmic contraction of the whole heart.

- Endothelial cells - those are the supporting epithelial cells, insulating the chambers of the heart and the veins.

Epicardium or inner layer of serous pericardium is the innermost layer of pericardium.

Injuries to the heart are very dangerous and can easily result in death, although with immediate medical care, it is sometimes possible to save a person whose heart is injured. Doctors can even transplant a new heart, to replace a damaged heart. Nonetheless, many people die as a result of heart failure. It is a common cause of death.

NO. Arthropods do not have a 4 chambered hearts.

The heart pumps oxygen-rich blood through arteries which take the blood to muscles. Then when the oxygen is deprived of its oxygen it is pumped back to the heart where it is then sent to the lungs for more oxygen. It then repeats the process. This process is important because your muscles need oxygen to function.

Really, I know just a factor which is that the veins have a valve which helps to push the blood. This is because the vein has a thin muscular wall and low pressure. Therefore,the valve is there to prevent the flow back of blood.

deoxyribonucleus acid

The arteries

Camera

Sneezing, also called sternutation, is an involuntary, sudden and violent rush of air out through the nose and mouth. The body takes this action to get rid of irritating or harmful objects in the nose. Sneezing aids the body, but can be harmful to other people. For example, the nose fills with congestion that contains germs when a person has a cold. Sneezing helps clear the nose. But unless the sneezer covers the mouth and nose, the germs escape into the air and may infect others.

The function of the serous membrane is line the body cavities that do not open directly to the outside
lubrication

An earthworm does not have a heart. But, it possess an organ called an aortic arch that performs similar functions of the heart.

when blood enters the heart its a bright cherry red colour

when it leaves its a dull red/ brown colour

hope this helps :) x

The main vessel that transports blood away from the heart and towards the body is the aorta. The other vessel is the pulmonary trunk. It transports blood away from the heart and towards the lungs.

The average resting heartbeat for all humans before reaching the age of approximately 45 is 72 beats per minute. 90 BPM as a resting pulse is high when compared to the average. However, there is no cause for alarm as long as you are healthy and not having any symptoms of a problem. A higher pulse simply means that your heart is emitting an insignificantly smaller amount of blood when compared to an average heart beat. Consequently, your heart will beat more to provide the blood needed for the body.

There are many benign reasons to account for elevated resting pulse rates including stress, tension, anxiety and adrenaline. There are also malevolent reasons such as high blood pressure. If you are athletic, your resting heartbeat will decline. As you age, your resting heartbeat can increase (although will not necessarily do so) and should not do so significantly.

Generally, there is no cause for concern as you are within the range of normal.

I think it's false but I can't be sure you might want to try someone else. I thought oxygenated blood went to teh lung by the arteries but hey better if you check with someone else uless your willing to risk it.

The Myth is that if your baby's heart rate is over 140 then it's a girl and if under then it's a boy. That's simply not proven. Just an old wives tale. A study of over 200 women done by the Journal of Reproductive Medicine in 1996 shows no truth to the myth.

The average child's heart rate will be 70-110. An adolescent's heart rate will be between 60-100.