Vertebrate Muscle; Actions Flashcards

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1
Q

Contraction

A

Moving from relaxed elongate state to a short, fat state.

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2
Q

Striations

A

Tiny bands visible microscopically

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3
Q

Smooth Muscle Appearance

A

Non-striated, involuntary, small spindle shaped, each with a single nucleus.

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4
Q

Smooth Muscle Description

A

Smooth muscle causes motion associated with internal organs. (Example: Muscle contraction of the uterus, such as giving birth)

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5
Q

Skeletal Muscle Appearance

A

Striated, voluntary, large diameter, multi-nucleate cells

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6
Q

Skeletal Muscle Description

A

Drives motion of the skeleton & skin

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7
Q

Cardiac Muscle Appearance

A

Striated, involuntary, branches form connections between cells “Intercalated Discs” seen as very dark striations, single nucleus

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8
Q

Cardiac Muscle Description

A

Composes the muscle of the heart

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9
Q

Intercalated Discs

A

Facilitate coordinated contraction between the cells (appear as very dark striations)

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10
Q

Flexion

A

A movement that decreases the angle of a joint & lessons the distance between two bones. (Example: Bringing the knee towards your chest)

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11
Q

Extension

A

A movement that increases the angle of a joint & increases the distance between two bones (Example: Bending the elbow away from the chest)

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12
Q

Abduction

A

A movement of a limb away from the midline or medial plane of the body; generally in the frontal plane. (Example: Fanning of fingers or toes when they spread apart)

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13
Q

Adduction

A

A movement of a limb toward the mid-line or medial plane of the body, generally in the frontal plane. (Example: Opposite of abduction)

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14
Q

Calcaneal Tendon otherwise known as:

A

Achilles Tendon

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15
Q

Temporalis Muscle

A

Origin (sight that doesn’t move during contraction): Dorsal Cranium (back of head)

Insertion (sight that does move during contraction): Mandible (Jaw or jawbone)

Muscle Action: Elevation of the mouth (helps the mouth to close)

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