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-The muscle of which the heart is made is called cardiac muscle.

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1. It is made of interconnecting cells, whose cell surface membranes are very tightly joined together.
2. Single central nucleus
3. striated like skeletal muscle
4.This close contact between the muscle cells allows waves of electrical excitation to pass easily between them, which is a very important feature of cardiac muscle.

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1. Carry out unconscious task: contraction of the heart.
2. Branching cells connect at intercalated disks which allow contractions to occur faster.

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-Found in digestive system or respiratory system
-Found in hollow organs like the intestine, bladder, lungs, and blood vessels

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1. Non-striated
2.  Involuntary
3. Are spindle-shaped and have a single nucleus
4. With a centrally located nucleus
5. Connected by a connective tissue
6. Smooth muscle fibrs are thousands of times shorter than skeletal muscle fibres.

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Single unit(found in viscera)
--single-shaped sheets of cells, that are located close to each other

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Multi-unit(found in irises and walls of the blood vessels)
--less organised and separate themselves

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contraction: move substances by contracting slowly

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-Are usually called “muscle fibers”
-Attached to bones and move our skeleton

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1. Striated muscle

2. Voluntary

3. More than one nucleus

4. Long, thin and cylindrical

5. Refers to multiple bundles (fascicles) of cells joined together called muscle fibers. The fibers and muscles are surrounded by connective tissue layers called fasciae.

6. Composed of myofibrils. The myofibrils are composed of actin, myosin and titin

7. Repeated in units called sarcomeres.

8. The sarcomere is responsible for the striated appearance of skeletal muscle, and forms the basic machinery necessary for muscle contraction.

9. new fibers are produced by stem cells

10. Striations -- cross stripes (bands) run perpendicular to the cells
11. Blood vessels and nerves run through the connective tissue supplying muscle cells with oxygen and nerve impulses that allow for muscle contraction.

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1. Provide movements by muscle contraction
2. contraction of skeletal muscle produce heat which help to maintain the body temperature
3. add stability to joints that have poor reinforcement
4. voluntary movement(e.g. limb,toe  neck, leg)