Dominic Stone
Cardiac muscle, also known as myocardium, is one of three types of vertebrate muscle tissues, the others being skeletal and smooth muscle. It is an involuntary, striated muscle that makes up the thick middle layer of the heart. The primary function of cardiac muscle is to contract, which generates the pressure needed to pump blood through the circulatory system. The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart's pacemaker.
| Characteristics | Values |
|---|---|
| Type of muscle | Cardiac muscle, also called myocardium or heart muscle |
| Location | Thick middle layer of the heart |
| Outer layer | Epicardium (AKA visceral pericardium) |
| Inner layer | Endocardium |
| Blood supply | Coronary circulation |
| Cells | Cardiomyocytes |
| Function | Contraction, which generates the pressure needed to pump blood through the circulatory system |
| Contraction | Involuntary, rhythmic |
| Contraction trigger | Increased concentration of calcium within the cytosol |
| Contraction cycle | Diastole (relaxation and refilling with blood) and systole (contraction and pumping of blood) |
| Electrical impulses | Spontaneously generated and sent out |
Explore related products
What You'll Learn
The primary function of cardiac muscle is to contract
Cardiac muscle contracts in a similar manner to skeletal muscle, although with some important differences. Unlike skeletal muscle, cardiac muscle exhibits rhythmic contractions and is not under voluntary control. The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart's pacemaker. The cardiac action potential subsequently triggers muscle contraction by increasing the concentration of calcium within the cytosol.
The primary function of cardiomyocytes, the individual cells that make up the cardiac muscle, is to contract, which generates the pressure needed to pump blood through the circulatory system. Rapid, involuntary contraction and relaxation of the cardiac muscle are vital for pumping blood throughout the cardiovascular system. The amount of blood pumped by the heart per minute (the cardiac output) varies to meet the metabolic needs of peripheral tissues, particularly the skeletal muscles, kidneys, brain, skin, liver, heart, and gastrointestinal tract.
Exploring the Muscles Behind Your Lips' Movement
You may want to see also
Explore related products
The cardiac cycle
Cardiac muscle, or myocardium, is one of three types of muscle in the body, along with skeletal and smooth muscle. It makes up the thick middle layer of the heart, between the outer layer of the heart wall (the pericardium or epicardium) and the inner layer (the endocardium). The myocardium is composed of individual cardiac muscle cells, or cardiomyocytes, which are joined by intercalated discs and encased by collagen fibres and other substances that form the extracellular matrix.
The primary function of cardiomyocytes is to contract, which generates the pressure needed to pump blood through the circulatory system. The contraction of cardiac muscle is similar to that of skeletal muscle, beginning with a flow of ions across the cell membrane known as an action potential. This action potential triggers muscle contraction by increasing the concentration of calcium within the cytosol.
Cardiac muscle differs from skeletal muscle in that it exhibits rhythmic contractions and is not under voluntary control. The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart's pacemaker. The amount of blood pumped by the heart per minute (the cardiac output) varies to meet the metabolic needs of peripheral tissues.
The Colon's Muscular Power: Understanding Its Role
You may want to see also
Explore related products
The sinoatrial node of the heart regulates the rhythmic contraction of cardiac muscle
The primary function of cardiomyocytes is to contract, which generates the pressure needed to pump blood through the circulatory system. The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart’s pacemaker. The heart consists mostly of cardiac muscle cells (or myocardium). The outstanding characteristics of the action of the heart are its contractility, which is the basis for its pumping action, and the rhythmicity of the contraction.
The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, following a period of robust contraction and pumping of blood, called systole. The cardiac action potential subsequently triggers muscle contraction by increasing the concentration of calcium within the cytosol.
Cardiac muscle differs from skeletal muscle in that it exhibits rhythmic contractions and is not under voluntary control. The amount of blood pumped by the heart per minute (the cardiac output) varies to meet the metabolic needs of peripheral tissues, particularly the skeletal muscles, kidneys, brain, skin, liver, heart, and gastrointestinal tract.
Yoga for Muscle Tension: Does It Work?
You may want to see also
Explore related products
Cardiomyocytes are the individual cells that make up the cardiac muscle
The primary function of cardiomyocytes is to contract, which generates the pressure needed to pump blood through the circulatory system. The rapid, involuntary contraction and relaxation of the cardiac muscle are vital for pumping blood throughout the cardiovascular system. The physiology of cardiac muscle shares many similarities with that of skeletal muscle. The primary function of both muscle types is to contract, and in both cases, a contraction begins with a flow of ions across the cell membrane known as an action potential.
The cardiac action potential subsequently triggers muscle contraction by increasing the concentration of calcium within the cytosol. The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, and one during which the heart muscle contracts and pumps blood, called systole. The rhythmic contraction of cardiac muscle is regulated by the sinoatrial node of the heart, which serves as the heart's pacemaker.
Cardiomyocytes are also responsible for generating and sending out electrical impulses.
Understanding the Brain's Control Over Involuntary Muscles
You may want to see also
Explore related products
The myocardium is surrounded by a thin outer layer called the epicardium
The myocardium, or cardiac muscle, makes up the thick middle layer of the heart. It is surrounded by a thin outer layer called the epicardium (or visceral pericardium) and an inner endocardium. The coronary arteries supply blood to the myocardium, and the cardiac veins drain this blood. The myocardium is composed of individual cells called cardiomyocytes, which are responsible for the rhythmic contraction of the heart. This contraction generates the pressure needed to pump blood through the circulatory system. The primary function of the myocardium is, therefore, to contract and relax rapidly and involuntarily, pumping blood throughout the cardiovascular system.
The physiology of the myocardium shares many similarities with skeletal muscle. For example, both muscle types contract in response to a flow of ions across the cell membrane, known as an action potential. This action potential triggers muscle contraction by increasing the concentration of calcium within the cytosol. However, the myocardium differs from skeletal muscle in that its contractions are rhythmic and involuntary. The sinoatrial node of the heart regulates these contractions, serving as the heart's pacemaker. The contractility and rhythmicity of the myocardium are the basis for its pumping action.
The myocardium is distributed throughout the heart and is responsible for several functions. One of its key functions is to generate and send out electrical impulses spontaneously. The amount of blood pumped by the heart per minute (the cardiac output) varies depending on the metabolic needs of peripheral tissues, including the skeletal muscles, kidneys, brain, skin, liver, heart, and gastrointestinal tract.
Theragun: Healing Power for Sore Muscles?
You may want to see also
Frequently asked questions
Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissues, the others being skeletal muscle and smooth muscle.
The primary function of cardiac muscle is to contract, which generates the pressure needed to pump blood through the circulatory system.
A contraction begins with a flow of ions across the cell membrane known as an action potential. The action potential triggers muscle contraction by increasing the concentration of calcium within the cytosol.
Cardiac muscle exhibits rhythmic contractions and is not under voluntary control. Skeletal muscle, on the other hand, is under voluntary control.
The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the beginning of the next. It consists of two periods: one during which the heart muscle relaxes and refills with blood, called diastole, and one during which the heart muscle contracts and pumps blood, called systole.
