Cardiac muscle fibers are mononucleate , with only one nucleus per fiber, and they can sometimes be branched. Smooth muscle is found in the walls of internal organs, such as the organs of the digestive tract, blood vessels, and others.
It consists of mononucleate fibers with tapered edges. No striations are visible in smooth muscle under the microscope. Because smooth muscle often is wrapping around the organ it is associated with, it can be hard to find an entire smooth muscle fiber in profile in a tissue slice on a microscope slide. Most of the fibers will be sectioned at angles or will be difficult to get into a single plane of focus, but a little bit of searching can usually turn up some with all of the defining characteristics visible.
Skip to main content. Module 5: Microscopy II — Tissues. Search for:. Lab 5 Exercises 5. Each cell is spindle shaped with a single nucleus and no visible striations Figure 4. Watch this video to learn more about muscle tissue. In looking through a microscope how could you distinguish skeletal muscle tissue from smooth muscle?
The three types of muscle cells are skeletal, cardiac, and smooth. Their morphologies match their specific functions in the body. Skeletal muscle is voluntary and responds to conscious stimuli. The cells are striated and multinucleated appearing as long, unbranched cylinders. Cardiac muscle is involuntary and found only in the heart. Each cell is striated with a single nucleus and they attach to one another to form long fibers.
Cells are attached to one another at intercalated disks. The cells are interconnected physically and electrochemically to act as a syncytium. Cardiac muscle cells contract autonomously and involuntarily. Smooth muscle is involuntary. Each cell is a spindle-shaped fiber and contains a single nucleus. No striations are evident because the actin and myosin filaments do not align in the cytoplasm.
You are watching cells in a dish spontaneously contract. They are all contracting at different rates, some fast, some slow. After a while, several cells link up and they begin contracting in synchrony. Discuss what is going on and what type of cells you are looking at. The cells in the dish are cardiomyocytes, cardiac muscle cells.
They have an intrinsic ability to contract. Chapter 8: Muscle Strength and Endurance. Search for:. Key Takeaways Key Points Skeletal muscles are attached to bones and allow voluntary movement of the body.
Smooth muscles, which generate involuntary movement, form part of the walls of the esophagus, stomach, intestines, bronchi, uterus, urethra, bladder, and blood vessels, among other portions of the body. Cardiac muscle is involuntary and found only in the heart. Skeletal muscle is striated in regular, parallel bundles of sarcomeres. Cardiac muscle is striated, but the bundles are connected at branching, irregular angles called intercalated discs.
Glossary cardiac muscle : The striated and involuntary muscle of the vertebrate heart. Examples A girl is taking a walk, using her voluntary control of her skeletal muscles to move her body down the path. Licenses and Attributions.
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