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23 Cards in this Set
- Front
- Back
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Intercalated discs in the cardiac muscle allow for?
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The heart muscle cells to contract at the same time.
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Long muscle cells are…
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Multi-nucleated (out in the peripheral) and striated.
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What are myofibrils?
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long tubes in the muscle cells that have myofilaments in it
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What are the two myofilaments?
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myosin and actin
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A bands are made of which myofilament?
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myosin (thick filament)
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I bands are made up of which myofilament?
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actin (thin filament)
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Where are Z bands?
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Down the center of the I band
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Area between the Z bands?
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Sarcomere
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Define sarcomere.
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Structural and Functional unit of skeletal muscle.
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What is the functional structional unit of compact bone?
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Aversion system
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Steps of Contraction
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"1. Nerve impulse comes in to the sarcolema.
2. Which influences the endoplasmic (sarcoplasmic) reticulum (ER) to release calcium. 3. Allowing the Z bands to approach each other (the sarcomere shortens)" |
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What happens during relaxation?
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The calcium returns to the sarcoplasmic reticulum.
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Which bands remain the same?
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A and I bands.
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Which bands come together?
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Z-bands.
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What is blood?
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Connective tissue with cells and a matrix.
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What distinguishes blood from other connective tissue?
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The matrix in blood is plasma.
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Normal constituents of blood are…
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The formed elements of blood.
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The formed elements of blood are…
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Cells, corpuscles, and cell fragments.
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Where blood is produced in a Fetus?
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bone marrow and liver.
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Where blood is produced in an Adult?
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bone marrow and lymphatic tissue (wbcs only).
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Amount of blood in the average child and adult?
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Child- 3 quarts Adult- 5 quarts
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Functions of blood?
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Transporting formed elements, nutrients and gasses, hormones, enzymes, and buffers as well a wastes.
Help maintain body heat. |
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Buffers in blood are responsible for…
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stabilizing the concentration of the hydrogen ions.
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