Cardiac muscle contracts in a coordinated way to allow your heart to beat. Like smooth muscle, it’s also involuntary. Examples of some of their functions include moving food through your digestive tract and changing the sizes of your pupil.
They’re found in your internal organs and eyes. Smooth muscles are involuntary, meaning that you can’t control them. Examples include walking, bending over, and picking up an object. These muscles are attached to your skeleton by tendons and control the voluntary movements of your body. The types of muscle tissue have different functions within your body: When the pacemaker cells generate an impulse, it spreads in an organized, wavelike pattern, which facilitates the beating of your heart. Second, cardiac muscle fibers are branched and interconnected. This typically happens at a constant pace, but can also speed up or slow down as necessary. Special cells, called pacemaker cells, generate the impulses that cause cardiac muscle to contract. Cardiac muscle fibers have some unique features.Ĭardiac muscle fibers have their own rhythm. Similar to skeletal muscles, cardiac muscles are striated. They’re also thousands of times shorter than skeletal muscle fibers. Smooth muscle fibers have an oblong shape, much like a football. Their more uniform appearance gives them their name. Unlike skeletal muscles, smooth muscles aren’t striated. They contain even less mitochondria than type 2A fibers and appear white. Instead, they store energy that can be used for short bursts of movement. Type 2B fibers don’t use oxygen to generate energy. However, they contain less mitochondria, making them light. Like type 1 fibers, type 2A fibers can also use oxygen to generate energy for movement. Type 1 fibers have a higher density of energy-generating organelles called mitochondria. These fibers utilize oxygen to generate energy for movement. Type 2 is further broken down into subtypes. Skeletal muscle fibers are classified into two types: type 1 and type 2. This causes the muscle tissue to be striated, or have a striped appearance. Each one of your skeletal muscles is made up of hundreds to thousands of muscle fibers that are tightly wrapped together by connective tissue.Įach muscle fiber contains smaller units made up of repeating thick and thin filaments.
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