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Which layer of the heart has actin myosin and intercalated discs?
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∙ 13y ago
The Myocardium
Wiki User
∙ 13y ago
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What type of of muscle is found only in the heart?
Cardiac muscle is found only in the heart. Cardiac muscle contains the proteins actin and myosin. All the other muscles are smooth or skeletal.
What are Heart Tissue?
The heart is a muscle, and as such has multiple tissues. The main tissue is cardiac muscle cells. These are striated, branched muscle cells held together with intercalated discs. Connective tissue forms a sac around the heart, and epithelial tissue forms blood vessels within the heart. Therefore, the heart contains all four types of tissue. It is mostly muscle tissue. Connective tissue forms a protective sac and holds the heart together, epithelial tissue forms the blood vessels, and nervous tissue carries impulses to and away from the heart. this is all true! ~Trenasian was here!
What does sympathetic activity do to the heart rate and stroke volume?
yes it increases it by having epinephrine and//or norepinephrine bind to beta 1 receptors on the ventricle of the heart which causes a second messanger system of cyclic AMP to phosphorylate 1) voltage gated calcium channels to stay open longer so more calcium comes inside cell from outside so more Ca can be stored in sarcoplasmic reticulm (SR) but also more interaction between actin and myosin. 2) phosphorylates calcium pump which increases its activity so more calcium can be stored in SR so there is a bigger force (bigger Stroke volume). AND also removes calcium from cytosol faster (calcium back into cisterna), which shortens the duration of refractory period which increases heart rate.
What are heart enzymes?
Enzymes of the heart.ANSWER 2 Different Cardiac EnzymesThe heart is a muscular pump. When a person experiences a heart attack, a portion of the heart muscle is damaged, causing symptoms such as shortness of breath, chest pain that can radiate, nausea, vomiting, dizziness and sweating. One way of determining whether these symptoms are the result of actual heart dysfunction or heart attack is through blood tests that evaluate the cardiac enzymes. When the heart muscle is damaged, it releases these cardiac enzymes into the bloodstream. When a blood test measures increased cardiac enzymes, it is an indicator that actual damage has resulted.Creatinine PhosphokinaseAccording to the American Heart Association, the most common cardiac enzyme to be tested when a heart attack is suspected is creatinine phosphokinase (CPK). This enzyme is normally present in small amounts in the blood and is released by all muscle tissue in the body--skeletal, cardiac and smooth muscle. When CPK is elevated, it indicates muscle damage and further tests can be ordered. Often, when a patient enters a medical facility complaining of heart attack symptoms, elevated CPK may be the only indicator that a heart attack has actually occurred. Sometimes CPK will not read high in the blood until 24 hours after the heart attack, so careful monitoring for a period of time is required. CPK-MBCPK-MB is a fractional piece of creatinine phosphokinase. Although CPK is released from all muscle tissue in the body, CPK-MB is released only from damaged heart tissue, so it is much more accurate in determining whether a heart attack has occurred. CPK-MB is diagnostic for a heart attack even in the presence of a normal EKG. CPK-MB may not be elevated in the blood until 12 to 24 hours after a heart attack. Increased accuracy in diagnosis may be found by repeating the CPK-MB blood test multiple times over the first 24 hours, looking for changes in levels. TroponinsTroponins, proteins found in muscle tissue, help modulate actin and myosin, which are responsible for muscle contraction. Some very specific troponins have been identified as occurring only in the heart muscle, specifically Troponin T and Troponin I. These can be tested for and measured. These troponins are normally present in very low quantities in the blood. When elevated, they can indicate even very minor heart tissue damage that may not show up with a CPK test. Troponin typically shows up in the blood as elevated within 12 hours after a heart attack. By measuring Troponin and CPK, it is possible to diagnose a heart attack even when other tests may be negative.
What are some diseases that occur in the heart?
Coronary heart diseaseCardiomyopathyCardiovascular diseaseIschemic heart diseaseHypertensive heart diseaseInflammatory heart diseaseValvular heart diseaseHeart Cancer
How does the structure of cardiac myocytes and intercalated discs follow the function of cardiac muscle tissue and the heart?
The structure of the heart is very complex. Cardiac myocytes and intercalated discs follow the function of cardiac muscle tissue and the heart make up part of this very complex system
What is the relationsip between intercalated disk and myocardium?
Intercalated discs are very complex structures and have great significance in terms of the workings of the myocardium. These discs create a high degree of interconnection between the myocardial cells.
Where are intercalated disks found?
inside Valerie's heart!! AWWWWW HOW CUTE! YAY FOR JACKIE
The heart layer containing intercalated disks?
The layer of the heart containing intercalated disks is the myocardium. Myocardium is one of the tissues of the heart that is made of cardiac muscles.
What type of of muscle is found only in the heart?
Cardiac muscle is found only in the heart. Cardiac muscle contains the proteins actin and myosin. All the other muscles are smooth or skeletal.
What is the purpose of intercalated discs in cardiac muscle tissue?
An intercalated disc forms connections between neighboring cells in the heart. Two types of connections are formed at each intercalated disc, which connects the cell membranes of two myocytes (heart muclse cells). One is a physical connect and the other is a chemical link. These allow the heart to beat as if it is almost one cell. Other factors slow the coordination so that the heart muscle will contract top to bottom.
What are the two microscopic features of cardiac cells that help distinguish them from other types of muscle cells?
Cardiac muscles are found solely in the heart. The involuntary muscles making up the heart don't suffer fatigue like the regular muscles do.
Where are intercalated disc found?
Cardiac muscle.
What are the muscular cells?
Smooth (organs)Cardiac (heart muscle)Skeletal (movement, support, strength)Muscle cells have a nucleus just like other cells. The basic units of a muscle cell are the actin and myosin filaments that slide past each other to allow flexion and extension of your joints.
Why rigor mortis occurs?
Rigor mortis is caused by the loss of ATP. Oxygen is required for cellular respiration to provide ATP, but once the heart stops pumping, the supply of Oxygen stops. As a result, the muscles begin to decompose and harden. no ATP is available to release attached actin and myosin molecules
What helps the muscular system to work?
Although the heart pumps blood with the ions of calcium necessary for the contraction and the brain sends the electrical signals for contraction the muscular systems mainly needs calcium ions for contraction and that the proteins that make up its cell work properly (myosin and actin and other filaments in the sarcomeres.
What are Heart Tissue?
The heart is a muscle, and as such has multiple tissues. The main tissue is cardiac muscle cells. These are striated, branched muscle cells held together with intercalated discs. Connective tissue forms a sac around the heart, and epithelial tissue forms blood vessels within the heart. Therefore, the heart contains all four types of tissue. It is mostly muscle tissue. Connective tissue forms a protective sac and holds the heart together, epithelial tissue forms the blood vessels, and nervous tissue carries impulses to and away from the heart. this is all true! ~Trenasian was here!
