Pacemaker cells, also known as the sinoatrial (SA) node, are specialized cells in the heart that generate electrical impulses to regulate its rhythm. These cells initiate each heartbeat and set the pace for the entire heart.
in the bones
Another way to say "make copies of cells" is "replicate the cells".
Nerve cells, also known as neurons, are located within the nervous system. They are the building blocks of the nervous system and are found throughout the brain, spinal cord, and peripheral nerves in the body.
The dead cells that make up a hair are called keratinocytes.
The SA (sinoatrial) node is a cluster of cells in the upper part of the right atrium (aka the right upper chamber of the heart).
The group of cells responsible for adjusting the heart rate are known as the sinoatrial node (SA node) and the atrioventricular node (AV node). The SA node generates the electrical impulses that initiate each heartbeat, while the AV node delays the impulse to allow the atria to contract before the ventricles. Together, these nodes help regulate the heart rate and ensure proper coordination of heart contractions.
The sinoatrial node, or SA node. This group of cells initiate the electrical impulse through the heart in a normal heart rhythm, also called a normal sinus rhythm. Impulses can begin in other areas of the heart, but this typically causes an irregular heart beat.
Pacemaker cells, also known as the sinoatrial (SA) node, are specialized cells in the heart that generate electrical impulses to regulate its rhythm. These cells initiate each heartbeat and set the pace for the entire heart.
Blood cells are produced from bone marrow. This is gel like substance that is located inside the bone.
The pacemaker of the heart is a bundle of cells that tells the heart when to beat. These cells are connected to the rest of the cells of the heart and communicate with them through electrical signals. The pacemaker cells set the pace (or rate) of the heartbeat.The actual structure that serves as the heart's primary pacemaker is called the sinoatrial node (SA node). As described above, the SA node is a little bundle of cells located in the wall of the right atrium, the small upper chamber on the right side of the heart.What if the SA node is knocked out for some reason? There are actually other regions of the heart that can act as pacemakers. These regions are known as latent pacemakers and include the atrioventricular node (AV node) and other cells that make up the electrical communication system of the heart (including special cells that make up the so-called Purkinje fibers of the heart). Even the cells that make up the large ventricles of the heart can set the pace of the heart.Interestingly, each of the pacemakers described above has a different inherent rate that it "wants" the heart to beat at. For example, the SA node gets excited spontaneously at a rate of about 100 per minute. Some of the latent pacemakers might spontaneously get excited at a rate of 65 per minute or 45 per minute.If that's the case, then wouldn't the heart just beat chaotically? How is it possible that the heart beats in a regular way with all of these different pacemakers lying around?The reason is that under normal circumstances, only the SA node is active; all of the other latent pacemakers are basically inactive. Now, should the SA node fail, the AV node can take over. Likewise, if the AV node fails, cells that make up the Purkinje fibers can take over. And if even they fail, then the ventricular cells can take over as a last resort. There's lots of redundancy for this all-important organ.Another type of pacemaker is the type that gets implanted by physicians. In patients with abnormal heart rates or rhythms, an artificial pacemaker can be implanted. These pacemakers serve the same purpose as the natural pacemakers of the heart: they control the regular rate and rhythm of the heart.
This material is called DNA. It is located in the nucleus of the cell. It acts as the main office and sends out information telling the cell what to make.
in the bones
in the digestive tract
The cuticle of a leaf is primarily made up of cells called epidermal cells. These cells are located on the outer layer of the leaf and secrete a waxy substance that forms the protective cuticle layer.
In the adult intestines, the stem cells that generate new cells to protect the tissues are located in the intestinal crypts. These stem cells are found at the base of the crypts and continuously divide to produce new cells that migrate upwards to replace the older cells that line the intestinal surface.
cells that contain chlorophyll do, like plant cells. but cells like animals cells do not make their own food