Cardiac muscle cells form a highly branched cellular network in the heart. They are connected end to end by intercalated disks and are organized into layers of myocardial tissue that are wrapped around the chambers of the heart.
- 1 What is the structure and function of cardiac muscle?
- 2 What are the structural characteristics of cardiac muscle cells?
- 3 What structure is unique to cardiac muscle?
- 4 What is the function of the cardiac muscle?
- 5 What is cardiac muscle tissue?
- 6 What is the structure of muscle?
- 7 How does the structure of muscle tissue relate to its function?
- 8 What role does the unique structure of cardiac muscle play in its function?
- 9 What is a good description of cardiac muscle fibers?
- 10 Where is the cardiac muscle tissue located?
- 11 What are cardiac muscles quizlet?
- 12 How does the structure of cardiac muscle help it perform its function quizlet?
- 13 What is the shape of a cardiac muscle cell?
- 14 What does cardiac muscle look like?
What is the structure and function of cardiac muscle?
Cardiac muscle tissue is a specialized, organized type of tissue that only exists in the heart. It is responsible for keeping the heart pumping and blood circulating around the body. Cardiac muscle tissue, or myocardium, contains cells that expand and contract in response to electrical impulses from the nervous system.
What are the structural characteristics of cardiac muscle cells?
Four characteristics define cardiac muscle tissue cells: they are involuntary and intrinsically controlled, striated, branched, and single nucleated.
What structure is unique to cardiac muscle?
One feature unique to cardiac muscle is the presence of intercalated discs. These were originally believed to be another type of striation or stripe. From studies of these bands with the electron microscope it can be seen that these discs represent the end-to-end junction of adjacent cardiac muscle cells.
What is the function of the cardiac muscle?
Structure and Function Rapid, involuntary contraction and relaxation of the cardiac muscle are vital for pumping blood throughout the cardiovascular system. To accomplish this, the structure of cardiac muscle has distinct features that allow it to contract in a coordinated fashion and resist fatigue.
What is cardiac muscle tissue?
Cardiac muscle tissue is one of the three types of muscle tissue in your body. Cardiac muscle tissue is only found in your heart, where it performs coordinated contractions that allow your heart to pump blood through your circulatory system.
What is the structure of muscle?
Each skeletal muscle fiber is a single cylindrical muscle cell. An individual skeletal muscle may be made up of hundreds, or even thousands, of muscle fibers bundled together and wrapped in a connective tissue covering. Each muscle is surrounded by a connective tissue sheath called the epimysium.
How does the structure of muscle tissue relate to its function?
Each type of muscle tissue in the human body has a unique structure and a specific role. Skeletal muscle moves bones and other structures. Cardiac muscle contracts the heart to pump blood. The smooth muscle tissue that forms organs like the stomach and bladder changes shape to facilitate bodily functions.
What role does the unique structure of cardiac muscle play in its function?
THE UNIQUE FEATURE IS THE INTERCALATED DISCS. THE INTERCALATED DISCS HAVE TWO IMPORTANT FUNCTIONS: 1. IT HOLDS THE MYOCYTES TOGETHER SO THAT THEY DO NOT PULL APART WHEN THE HEART CONTRACTS; 2. IS TO ALLOW AN ELECTRICAL CONNECTION BETWEEN THE CELLS, WHICH IS VITAL TO THE FUNCTION OF THE HEART AS A WHOLE.
What is a good description of cardiac muscle fibers?
Cardiac muscle is striated muscle that is present only in the heart. Cardiac muscle fibers have a single nucleus, are branched, and joined to one another by intercalated discs that contain gap junctions for depolarization between cells and desmosomes to hold the fibers together when the heart contracts.
Where is the cardiac muscle tissue located?
Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control.
What are cardiac muscles quizlet?
Cardiac Muscle. involentary, striated muscle found only in the heart. derived from mesenchyme which give rise to epicardium (outter linning or epithelial of the heart) and myocardium or muscle.
How does the structure of cardiac muscle help it perform its function quizlet?
Cardiac muscle cells form a functional syncytium by virtue of their intercalated discs. This structural feature plus the special arrangement of cardiac muscle in the heart allows the pumping action of the heart to be carefully coordinated for maximal efficiency.
What is the shape of a cardiac muscle cell?
Viewed through a microscope, cardiac muscle cells are roughly rectangular, measuring 100–150μm by 30–40μm. Individual cardiac muscle cells are joined together at their ends by intercalated discs to form long fibers.
What does cardiac muscle look like?
Cardiac muscle tissue, like skeletal muscle tissue, looks striated or striped. The bundles are branched, like a tree, but connected at both ends. Unlike skeletal muscle tissue, the contraction of cardiac muscle tissue is usually not under conscious control, so it is called involuntary.