Cardiac Muscles
Cardiac Muscles
Muscle
Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. There are present different type of muscles in the body. One of these muscles is Cardiac muscles which are present in the heart.
Cardiac Muscles
These too are involuntary muscles, but they are found only in the heart. The muscle fibres are uninucleate and branched. These branches are united by intercalated discs. They also have some characteristics of the non striated and striated muscles. Each fibre is surrounded by sarcolemma and the myofibrils present in the sarcoplasm gives the muscles a striated appearance. The nucleus is centrally located. These muscles contract rapidly and rhythmically throughout life without any external stimulation. They never get tired and continually help pump blood throughout the life of an individual.
Which of the following are correct : (a) Cardiac muscles are involuntary muscles, but they are found only in the heart. (b) Cardiac muscles are involuntary muscles, but they are found only in the brain. (c) Muscle cells contain protein filaments of actin and myosin. | |||
| Right Option : C | |||
| View Explanation | |||
Lymph is devoid of | |||
| Right Option : C | |||
| View Explanation | |||
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