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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
How does the heart keep the blood moving in the body?
The heart has an area called the sinuatrial node, often called the SA node, in the upper right atrium. The SA node is responsible for generating a never-ending series of rhythmic electrical pulses that radiate through specific electrical conduction pathways in the heart. The heart muscle contracts when stimulated by one of these electrical pulses. The SA node and the conduction pathways coordinate the timing and delivery of the electrical stimulations at various locations in the heart muscle so that the heart contractions result in a coherent and productive pumping action.
For more information, follow the link below to the Wikipedia article on the electrical conduction system of the heart.
If the lymphatic system didn't exist what would happen to the cardiovascular system?
Our blood pressure would decrease.
stallings
How can stroke volume can be altered?
Stroke volume is determined by three factors, altering any of them can change the stroke volume. These factors are preload, afterload, and contractility.
The relationship is: SV = P*C/A
What this means is that preload and contractility are directly proportional to the stroke volume and afterload is inversely proportional to stroke volume. If you increase preload (within certain limits), stroke volume will increase according to the Starling curve. Increasing contractility (many things can increase this), makes the heart pump harder and increases stroke volume. Increasing afterload decreases stroke volume. All of these can be reversed (decreasing preload and contractility = decreased stroke volume, etc).
Get a good physiology book and it will explain all of this very well.
Why could a hole in the interventricular septum be extremely dangerous?
you idiots dont know nothing.. if you did this would have been answered already.. answers.com is a fake... aint on here
Why doesn't the iron in human bodies attract magnetic objects?
There are two types of iron: magnetic and non-magnetic iron. The iron in your body is the non-magnetic kind.
Where and how does process of glomerular filtration occur?
it occurs in the glomerulare (Bowman's) capsule.
Draw the internal as well as external structure of a human heart?
In the physical, material sense, the human heart is a vital organ of muscles which pumps blood throughout the human body. In the higher sense of your question, such as understanding the use of "heart" in "We worship God in heart, soul and mind."; here the word "heart" means the very core of your being: God's free Gifts of your absolute (forever unchanging) personality and God's spiritual Essence -- the perfect will of God -- within each normal human being. This is the unique You to be perfected and eternalized in the Finality of Destiny in infinite-eternal Paradise and in God. When the human personality (heart) freely chooses in mind to seek and do the will of God; then that conjoint (combined ) will-union results in a higher "You" as a potentially eternally ascending soul into ever higher spirit forms for universal (cosmic) functioning as a Divinely Beloved Son or Daughter of God in Spirit and in Truth. Physically, the heart is a biological fluid pump that moves the blood. Therefore the only thing to be found contained within the human heart is blood. The rhythm of the heart is uniquely influenced by human emotions. The resultant impact of emotions upon the heart is that it has a proportional effect upon the person's physical and mental wellbeing. There is absolutely no truth in any notion that such an entity as a soul or God resides within a human's heart. There have been many heart transplants and no transmigration of any souls took place. Therefore the fairytale about God/soul/spirit within the human heart is as realistic as Santa and the North Pole.
Which is a type of circulatory shock?
Vascular, due to extreme vasodilation as a result of loss of vasomotor tone
The main use of iron in the body is to make heme, the protein building block of hemoglobin. Hemoglobin is the oxygen transporter molecule in red blood cells. There are also other uses but together they take far less than the production of heme does.
What in your circulatory system helps to prevent you from getting sick?
your white blood cells. they fight off germs, diseases, and viruses.
Sympathetic activity during hypobaric hypoxic condition would increase while parasympathetic action would decrease. Parasympathetic activity via the vegus nerve would decrease its affects on the AV and SA nodes because of the increase in sympathetic activity. Cyclic AMP from the increase in sympathetic activity blocks Ach from binding muscarinic receptors on the nerves. This blocking of Ach would slow G protein from keeping leak K channels being open and for the G Protein to slow its closing of T-type Ca channels. Increase in sympathetic activity leads to norepinephrine and epinephrine being released. They bind to B1 receptors that activate Gs to activate Adenylate cyclase to activate cAMP that causes pro Kinase to open funny channles and t-type Ca channles causing depolerization.
By generating electrical impulses.
By: isamar
The individual cells in a heart actually can beat on their own without any nervous stimulus. However, the cells have to beat together to have a heart that functions the right way. There is a conduction system in the heart made of specialized heart cells that make the rhythm. There are two main "nodes" called the SA node and AV node. The SA node starts the beat. The AV node is a sort of back up for the SA node. There are other special heart cells that made up of special fibers that transmits the signal through out the walls of the heart.
What does the excretory system work with?
the excretory system interacts with the circulatory system and the respiratory system
it works with the lungs ,large intestine and the kidneys. There are some things in our body that can't be used and may even be dangerous to your body. They need to be rid of. The job of the excretory system is to get rid of that waste.
The Excretory System interacts with your Digestive System as they both work with the Nervous System in both conscious and unconscious ways. While digestion goes on without your thoughts, eating, urinating, and defecating is under your control.
The undigested food remains are expelled outside the body. The large intestine & anus are the last two organs related to the Digestive System. Solid waste is filtered out by the digestive system.
It also works with the Circulatory System as it carries blood around the body to function. All of our blood runs through our kidneys every day. There is an artery and a vein that runs into and out of each kidney to take the blood there and back.
Without the excretory system, the other parts of the body would eventually be poisoned by waste.
Read more: How_does_the_Excretory_system_work_with_other_body_systems
The Digestive System! they help by sending nutrients and blood to this system
Where does blood from the right atrium go to in the right side of the heart and then to what artery?
right atrium -> right ventricle -> pulmonary artery -> pulmonary vein -> left atrium -> left ventricle -> aorta
These Receptors are present in Carotid and Aortic Arteries of Tetrapods and they have a vital role in regulation of Blood Pressure.
Does AMI affect the skeletal system?
Only directly if the person needs open heart surgery for a coronary artery bypass and they have to cut through the bone to open their chest at the sternum to get to the heart.
An AMI is an Acute Myocardial Infarction, which is better known as a "heart attack". It is a sudden onset of symptoms (acute onset) that usually include severe chest pain, shortness of breath, sweating, arm or jaw pain, etc. These symptoms are caused by damage to the muscle of the heart.
Myocardial just refers to the heart muscle and Infarction means tissue death. When you have an AMI there is a lack of oxygen to the heart muscle caused by obstructed blood flow, ruptured aneurysm, or some other reason the heart tissue is not getting enough blood/oxygen supply. When a spot on the heart is deprived of blood flow long enough, then the tissue in that spot can die. When the heart is injured this way it is unable to beat properly because the dead muscle is not doing its part and is sometimes floppy and in the way if a big enough portion of the heart.
