Heart and cardiac muscle

The right coronary artery supplies the right atrium, right ventricle, and lower posterior sections of the left ventricle. Cardiac muscle cells have a branched shape so that each cell is in contact with three of four other cardiac muscle cells.

These vessels then travel into the atrioventricular groove, and receive a third vessel which drains the section of the left ventricle sitting on the diaphragm. They communicate directly with each other by passing electrical impulses to the neighbor cells.

In addition to these muscular ridges, a band of cardiac muscle, also covered by endocardium, known as the moderator band reinforces the thin walls of the right ventricle and plays a crucial role in cardiac conduction. Each syncytium obeys the all or none law.

Medical Definition of Cardiac muscle

Similarly, the left atrium and the left ventricle together are sometimes referred to as the left heart. The left circumflex supplies the back and underneath of the left ventricle.

The sheets of muscle that wrap around the left ventricle closest to the endocardium are oriented perpendicularly to those closest to the epicardium. Like the right atrium, the left atrium is lined by pectinate muscles.

These contractile cells are connected by intercalated discs which allow a rapid response to impulses of action potential from the pacemaker cells. It is also known as the bicuspid valve due to its having two cusps, an anterior and a posterior cusp. What is the waste product of the cardiac muscle?

This is lined by a double inner membrane called the serous membrane that produces pericardial fluid to lubricate the surface of the heart.

The inner endocardium lines the cardiac chambers, covers the cardiac valvesand joins with the endothelium that lines the blood vessels that connect to the heart.

Cardiac Muscle Tissue

The dark bands represent areas of thick protein filaments made of myosin proteins that block light passing through the cell and appear dark. It is strong and resistant to tiring out, but it can only take so much.

These originate from the aortic root and lie on the outer or epicardial surface of the heart.

Cardiac muscle

Cardiac muscle tissue is able to set its own contraction rhythm due to the presence of pacemaker cells that stimulate the other cardiac muscle cells. The semilunar aortic valve is at the base of the aorta and also is not attached to papillary muscles.

It opens chemical or ligand-gated sodium and calcium ion channels, allowing an influx of positively charged ions. Each cardiomyocyte needs to contract in coordination with its neighbouring cells to efficiently pump blood from the heart, and if this coordination breaks down then — despite individual cells contracting — the heart may not pump at all, such as may occur during abnormal heart rhythms such as ventricular fibrillation.Medical Definition of Cardiac muscle Cardiac muscle: A type of muscle tissue that is found only in the heart and is distinguishable from the two other forms of muscle, smooth muscle (that moves internal organs, such as the bowels, and vessels, such as the artery walls) and skeletal muscle (that powers joints).

In muscle: Cardiac muscle. The heart is the pump that keeps blood circulating throughout the body and thereby transports nutrients, breakdown products, antibodies, hormones, and gases to and from the tissues.

Cardiac muscle tissue is an extremely specialized form of muscle tissue that has evolved to pump blood throughout the body. In fact, cardiac muscle is only found in the heart and makes up the bulk of the heart’s mass.

Terms to know Coronary Blood Vessels The vessels that deliver oxygen-rich blood to the myocardium are known as coronary arteries.

The vessels that remove the deoxygenated blood from the heart muscle are known as cardiac veins. Cardiac muscle tissue has autorhythmicity, the unique ability to initiate a cardiac action potential at a fixed rate – spreading the impulse rapidly from cell to cell to trigger the contraction of the entire heart.

There are specific proteins expressed in. Sep 01,  · The cardiac muscle is the heart, responsible for pumping blood throughout the body. It is made up of cardiac muscle and is the only place in the body where such muscle is found.

What is the Cardiac Muscle?

All the other muscles in the body are composed of either skeletal muscle or smooth muscle.

Heart and cardiac muscle
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