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Circulatory System
Circulatory System is the category for questions about the human circulatory system, including questions about the human heart, arteries, and veins.
2,116 Questions
Which heart valve is open under pressure?
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.
What structure in the heart distributes blood to body organs?
The Coronary arteries carry blood to the heart so the heart has its own supply of oxygen and nutrients to perform its function.
Relating to the force of blood going through the heart?
relating to the force if the blood going through the heart?
How would you describe the heart's ventricles?
The cardiac ventricles are the two lower chambers of the heart's four chambers. They are larger and more narrowed than the atria. They function by collecting the blood that flows into them from the atria and then contract in order to expel blood into the peripheral tissues, using major vessels to carry it to the extremities and lungs.
Is the main artery in your body?
The aorta is the main artery that takes blood from the heart to the body. The aorta drains the left atrium.
What is the function of a valve tendon in the heart?
The valves are attached to the heart wall by tendons as this allows the closure of the vavles to be controlled it also makes sure the the valve is completely closed to prevent backflow, which is potentially fatal.
OK i can only assume the question is reffering to the tendinae chordinae which connect the atrioventricular valves to the pappilary muscles projecting from the heart wall? The functions of these structures is to prevent the massive pressure difference, between the vetrivles and actria during systole, from pushing the the valve inside out and thus preventing backflow. NB the pappilary muscles and chordea tendinae are not involved in clossing or openinghte valves they just stop inversion.
Which electrolyte is important for the activity of the heart muscle?
There are four electrolytes that are important to heart function, potassium, calcium, sodium and magnesium. Calcium is important in the actual contraction of the heart.
Why are the two valves on the left side of the heart where there is high pressure?
It depends on the viewpoint of the observer ! Looking at the heart as if you're standing in front of the patient - the left ventricle and left atrium are on the right of the heart. If you're looking at the heart as if you're standing behind the patient - the chambers are correctly placed.
What does blood circulate that the body needs?
Blood circulates to provide nutrients and remove wastes in body tissues.
What does aerobic exercise do to the heart?
The heart is aerobic, and takes up a large amount of oxygen from the passing blood supply. Under anaerobic conditions, such as a blockage of one of the coronary arteries, the heart muscle which loses it's blood supply dies. This is a heart attack.
What part of the heart receives blood from left ventricle?
The walls of the left atrium contract to force blood through the mitral valve into the left ventricle.
What is the name for the inner lining of the heart?
The epicardium is the outer layer of the heart.
Epicardium
How does the brain heart lung work all together?
The heart and lungs work together to deliver oxygen to and remove carbon dioxide from the body's tissues. The brain uses this oxygen to function.
When alcohol is consumed, the heart function is increased and the ability of the heart to contract and move blood is increased
How bacterial endocarditis effects the circulatory system?
Bacterial endocarditis is infection of the inner lining of the heart caused by bacteria. People with serious valve disease are at greater risk for bacterial endocarditis.
What is the skeleton of the heart composed of?
This question is asking about the overall makeup of the heart and its structures which refer to its "skeleton":
It consists of rings of connective tissue that surrounds the pulmonary trunk and aorta at their proximal ends. It provides firm attachments for heart valves and muscle fibers.
Why are the heart and lungs so important to the human body?
Beacause the Heart pumps blood & oyxgen throughout your body, & your lungs use oxygen to keep your heart beating. If you want more information about this subject, you should probably ask your doctor. They would know this.
It is not the blood but the veins that "look" blue, and even then it is not the actual color of the vessel. The difference is in the way colored light moves through the tissues, and how the eye perceives those colors of light.
The oxidation state of the iron in the hemoglobin determines it's color; when the blood is oxygenated, the iron's oxidation state changes, changing the color of the blood from dark red to light red. It is never blue.
The changes in blood coloration relate to the respiratory pigment, hemoglobin. Hemoglobin is a topologically complex molecule that very readily binds to oxygen. Once the molecule is fully saturated, it reflects in the crimson red spectrum, and therefore fully oxygenated blood appears to be bright red.
After the hemoglobin molecule gives up its oxygen to tissue that needs it, the molecule becomes much less reflective, and thus deoxygenated blood appears very dark red to purple. But blue is used in charts and diagrams to contrast against red, red being the arterial system bearing O2 and blue being the "deoxygenated" blood in the venous system.
Human blood is always red. It can have different hues of red, but it is still red.
What blood vessel leaves the heart to pick up oxygen?
ARTERIES ALWAYS take blood AWAY from the heart.
What is the volume of the blood pumped by the heart per minute?
Your heart pumps about five liters of blood per minute. This is also called as cardiac out put. In severe exercise the cardiac out put can increase up to twenty five liters per minute.
Resting heart pumps about five liters of blood per minute. In severe exercise the heart can pump up to twenty five liters of blood per minute.
What carries blood toward the heart and have thinner walls?
The 2 modes of blood transport are the veins and arteries.
The way I use to remember is A is for away, so therefor arteries take blood away from the heart and veins go to the heart.
Veins NORMALLY carry oxygen poor blood
&
Arteries NORMALLY carry oxygen rich blood
Which layer of the pericardium is found closest to the heart itself?
Epicardium or inner layer of serous pericardium is the innermost layer of pericardium.
Why the aorta is the thickest wall vessels in the circulatory system?
aorta has to withstand high blood pressure because of which it needs thick walls !!
