Structure and Support

Front

Muscle Noun

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[muh-suhl]

Back

Muscle

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Strong tissue made of cells that can contract in an orderly way to produce movement in the body.

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Example: This diagram shows how muscle fibers are organized into bundles, helping muscles contract to produce movement.

Front

Contract Verb

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[kuhn-trakt]

Back

Contract

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To shorten or tighten, as when the cells of a muscle become shorter to cause movement.

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Example: Muscle fibers shorten as they contract, pulling on bones to cause movement.

Front

Mitochondria Noun

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[my-toh-kon-dree-uh]

Back

Mitochondria

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Organelles within a cell that generate most of the chemical energy needed to power the cell's biochemical reactions.

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Example: The image shows the mitochondria's structure, highlighting the cristae and matrix, which are essential for energy production.

Front

Skeletal Muscle Noun

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[skel-i-tl muh-suhl]

Back

Skeletal Muscle

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A type of muscle that attaches to bones and is consciously controlled to produce bodily movement.

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Example: This diagram shows the structure of skeletal muscle, including fibers and connective tissues, helping to understand how muscles attach to bones.

Front

Voluntary Muscle Noun

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[vol-uhn-ter-ee muh-suhl]

Back

Voluntary Muscle

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A muscle that a person can consciously control to perform specific actions, such as walking or lifting objects.

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Example: The image shows how voluntary muscles in the arm work, with labeled biceps and triceps.

Front

Cardiac Muscle Noun

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[kar-dee-ak muh-suhl]

Back

Cardiac Muscle

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A specialized type of involuntary muscle found only in the heart that contracts to pump blood throughout the body.

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Example: The image shows the heart wall layers, emphasizing the myocardium, which is the cardiac muscle layer that helps the heart pump blood.

Front

Involuntary Muscle Noun

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[in-vol-uhn-ter-ee muh-suhl]

Back

Involuntary Muscle

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A muscle that functions automatically without a person's conscious control, such as those in the heart or organs.

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Example: The image shows how involuntary muscles in the heart work automatically to pump blood.

Front

Smooth Muscle Noun

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[smooth muh-suhl]

Back

Smooth Muscle

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A type of involuntary muscle found in the walls of internal organs like the stomach and blood vessels.

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Example: The image shows smooth muscle in the small intestine, highlighting its structure and role in organ walls.

Front

Skeletal System Noun

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[skel-i-tl sis-tuhm]

Back

Skeletal System

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The body's framework of bones that provides support, protection for internal organs, and produces red blood cells.

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Example: The image shows the human skeletal system with labeled bones, helping students learn about the body's framework and support.

Front

Joint Noun

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[joint]

Back

Joint

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A location in the body where two or more bones meet, allowing for flexibility and enabling movement.

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Example: The image shows a synovial joint where bones meet, with fluid allowing smooth movement.