Quiz: Body Planes, Axes, Force & Gravity

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The frontal (coronal) plane divides the body into which two portions? *

Upper and lower halves

Medial and lateral portions

Front (anterior) and back (posterior) portions

Right and left halves

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Which of the following is an example where muscular force equals the force of gravity, resulting in a stable, stationary position? *

Holding a dumbbell still during isometric contraction

Rising up onto the toes using calf muscles

Bending the spine laterally to one side

A ball sinking to the bottom of a pool

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Elbow flexion and extension (e.g., a bicep curl) occur in which plane and around which axis? *

Transverse plane / Vertical axis

Sagittal plane / Frontal axis

Frontal plane / Vertical axis

Frontal plane / Sagittal axis

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Shoulder abduction and adduction are examples of movements that occur in which plane? *

Horizontal plane

Transverse plane

Sagittal plane

Frontal plane

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When two forces act at different points on an object in opposite directions, what type of motion is produced? *

Equilibrium — the object remains stationary

Linear translation in the direction of the greater force

Rotation / torque

Acceleration in the direction of the smaller force

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Where is the center of gravity (CoG) located in the human body? *

At the level of the navel (umbilicus)

At the level of the fifth lumbar vertebra (L5)

At the level of the first sacral vertebra (S1)

At the level of the second sacral vertebra (S2)

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Which of the following best describes an in human body movement?

The midline dividing the body into equal halves

The base of support for the body during standing

An imaginary flat surface on which movement occurs

An imaginary line about which movement occurs

Two equal forces act on the same point of an object but in exactly opposite directions. What is the result? *

The object accelerates in the direction of the larger force

The resultant force equals the sum of both forces

The object rotates around a central axis

The object reaches a state of equilibrium and does not move

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Where does the sagittal axis (transverse axis) run in relation to the body? *

Vertically from head to toe

Horizontally from front to back, perpendicular to the frontal plane

Diagonally from shoulder to hip

Horizontally from side to side

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In biomechanics, what does the of a force refer to?

The direction in which the force is applied

The number of joints involved in the movement

The type of muscle contraction producing the force

How much force is applied, represented by the length of an arrow

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