Cardiac muscle is a type of involuntary striated muscle found in the walls of the heart, particularly the myocardium. Cardiac muscle cells are identified as cardiac myocytes or cardiomyocytes. Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle. Cardiac muscle, different from skeletal muscle, is composed of separate cellular elements. A cardiac muscle cell has a large nucleus and numerous mitochondria. The elevated concentration of mitochondria reveals the huge energy burden that predominant the heart. Contractile proteins of actin and myosin myofilaments are in the cytoplasm. They form bands of varying density. The heart produces regular electrical impulses causing the muscle myofibrils to glide above one another and squeeze the cardiac muscle.
Some cardiac cells are self-excitable, contracting devoid of any signal from the nervous system. Each of these cells have their own inherent contraction rhythm. A section of the human heart called the sinoatrial node, or pacemaker, sets the rate and timing that all cardiac muscle cells contract. The SA node generates electrical impulses, from the SA node spreading rapidly through the walls of the artria, causing both artria to contract in unison. The impulses also pass to another section of specialized cardiac muscle tissue, a convey point called the atrioventricular node AV bundle or artioventricular bundle or Bundle or His. This collection of heart muscle cells are also specialized for electrical conduction that transmits the electrical impulses from the AV node to the point of the apex of the fascicular branches. The fascicular branches then lead to the Purkinje fibers then conduct the signals to the apex of the heart along and throughout the ventricular walls. The Purkinje fibers form conducting pathways called bundle branches.
The nervous system is made of these kinds of cells... -smooth muscle cells -nerve cells
Yes. Your entire body is made of cells. Cells > tissues > organs > organ systems (such as digestive and skeletal).
The immune system is made of cells, tissues, and organs.
Nope - the red cells carry oxygen and waste around the body - white cells are the defence system.
The hearts system is really the circulatory system which pumps blood around the body to keep you going. It is made up of different parts:The heartThe arteriesThe nervesThe cappilariesWithout these you will die.
Yes. The organ system itself is made up of cells.
its made of man cells
They're made in the bone marrow.
no
no
The circulary system
Immunity means the ability to resist. For example:to resist diseases Our body consists of immune system where the necessary cells some chemical substances consstantly offer resistance. Organs such as Thymus, spleen, lymphnodes, lymph vessels, bone morrow etc; Cells such as wbc, t-cells, b-cells, plasma cells, natural killer cells etc their chemical substances contribute to immunity and are parts and parcel of immune system. For better understanding please refer Dr. Janis Kuby's Text book "IMMUNOLOGY"