Is the heart muscle myogenic?
myogenic Originating in or produced by muscle cells. The contractions of cardiac muscle fibres are described as myogenic, since they are produced spontaneously, without requiring stimulation from nerve cells (see pacemaker).
Myogenic heart: The cardiac muscle possesses automaticity and contract spontaneously. A myogenic heart is capable of generating a cardiac contraction independent of nervous input. Neurogenic heart: A neurogenic heart requires nervous input to contract.
- Electrical impulses from the heart muscle cause your heart to beat (contract). This electrical signal begins in the sinoatrial (SA) node, located at the top of the heart's upper-right chamber (the right atrium). The SA node is sometimes called the heart's “natural pacemaker.”
- Muscle cells, commonly known as myocytes, are the cells that make up muscle tissue. There are 3 types of muscle cells in the human body; cardiac, skeletal, and smooth. Cardiac and skeletal myocytes are sometimes referred to as muscle fibers due to their long and fibrous shape.
- It's actually not all that easy to answer that simple question. But recently, scientists have made a pretty good effort. And their final count is…37.2 trillion. Calculating the number of cells in the human body is tricky.
Myogenic response refers to a contraction initiated by the myocyte cell itself instead of an outside occurrence or stimulus such as nerve innervation.
- Single-unit smooth muscle, or visceral smooth muscle is a type of smooth muscle found in the uterus, gastro-intestinal tract, and the bladder. Because of its myogenic nature, single-unit smooth muscle is usually active, even when it's not receiving any neural stimulation.
- Myogenic tone is a state of muscle tone in living creatures that originates from the muscle itself rather than from the autonomic nervous system or from hormone processes. It may be contrasted with neurogenic tone, which is created by actions of the autonomic nervous system.
- Hyperemia, hyperæmia, or hyperaemia (Greek ?πέρ (hupér, "over") + α?μα (haîma, “blood”)) is the increase of blood flow to different tissues in the body. It can have medical implications but is also a regulatory response, allowing change in blood supply to different tissues through vasodilation.
Updated: 22nd September 2018