Quiz: Body Planes, Axes, Force & Gravity

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

Horizontally from front to back, perpendicular to the frontal plane

Vertically from head to toe

Horizontally from side to side

Diagonally from shoulder to hip

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

Horizontal plane

Frontal plane

Sagittal plane

Transverse plane

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

Sagittal plane / Frontal axis

Frontal plane / Vertical axis

Transverse plane / Vertical axis

Frontal plane / Sagittal axis

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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

Acceleration in the direction of the smaller force

Linear translation in the direction of the greater force

Rotation / torque

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

At the level of the fifth lumbar vertebra (L5)

At the level of the second sacral vertebra (S2)

At the level of the navel (umbilicus)

At the level of the first sacral vertebra (S1)

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

An imaginary flat surface on which movement occurs

An imaginary line about which movement occurs

The midline dividing the body into equal halves

The base of support for the body during standing

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

Upper and lower halves

Right and left halves

Front (anterior) and back (posterior) portions

Medial and lateral portions

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

The object rotates around a central axis

The object accelerates in the direction of the larger force

The resultant force equals the sum of both forces

The object reaches a state of equilibrium and does not move

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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? *

Rising up onto the toes using calf muscles

A ball sinking to the bottom of a pool

Bending the spine laterally to one side

Holding a dumbbell still during isometric contraction

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

The number of joints involved in the movement

The type of muscle contraction producing the force

The direction in which the force is applied

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

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