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Intercalated discs and pacemaker cells are characteristic of?
cardiac muscle
Effect of calcium ions on the heart rate?
Calcium has no effect on heart rate. It does, however, have an effect on how hard the heart squeezes (inotropic effect). Heart rate is effected by the slow sodium channels in the pacemaker cells in the right atrium (and other pacemaker cells if the SA node is malfunctioning).
What structure lets calcium ions enter cardiac muscle cells?
sarcoplasmic reticulum
What is calcium channel blockers?
A calcium channel blocker is a drug that lowers blood pressure by either preventing calcium from entering cells of the cardiac muscle, or the smooth muscle cells of the blood vessel walls.
What type of cell initiates the ventricular contraction signal?
The pacemaker cells found within the atrioventricular node. These are actually cardiac muscles cells that beat on their own. They beat together when they touch.
What is a calcium channel blocker?
Calcium channel blockers are medicines that slow the movement of calcium into the cells of the heart and blood vessels.
Where are the cells that make up the sinoatrial node or pacemarker located?
Sinoatrial node is located at the junction of the superior vena cava with the right atrium. It is the normal cardiac pacemaker.
What is cardiac tissue made up of?
Cardiac tissue is made of cardiac muscle cells and a small amount of connective tissue. The cells that make this tissue are called cardiocytes. They have the special ability to "beat" on their own with no nerve stimulation. If one touches another beating cell, they will begin to beat together. In the heart some group will form a pacemaker to provide a rhythm for the organ.
Do cardiac muscles work in pairs?
No, cardiac muscles do not work in pairs. They are arranged in a network within the heart and work together in a coordinated manner to contract and pump blood throughout the body. The contraction of cardiac muscles is regulated by electrical signals from the heart's pacemaker cells.
What is the organelle that makes steroids in gland cells regulates calcium in muscle cells and breaks down toxins in liver cells is the?
The endoplasmic reticulum is involved in the production of steroids, the regulation of calcium and the breakdown of toxins.
What is the significance of the plateau phase seen in the action potential of cardiac muscle cells?
calcium channels remaning open.
What does a doctor do if the pacemaker is not functioning?
If your pacemakers are not functioning correctly, then a doctor will often use a defibrillator to shock them back into normal usage. Your pacemakers send electrical pulses to your cardiac muscles signaling them when it is time to contract. When these pacemakers (cells) are not functioning correctly, then the doctor will use the defibrillator to change their electrical currents, this way the pacemaker cells are fixed.
