A Frog Skeleton

question 50

Multiple Choice

A frog skeleton

• A)has a vertebral column consisting of only nine vertebrae and a urostyle.
• B)has a highly flexible vertebral column,an adaptation for transmitting force from the hindlimbs of the body.
• C)is,like that of crossopterygian,entirely cartilaginous.
• D)bears limbs with four digits on each hand and foot.
• E)All of these choices are correct.

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Definitions:

Optic Disc

The point in the eye where the optic nerve meets the retina, appearing as a small, circular area.

Pigmented Crescents

Darkened, crescent-shaped areas often found at the margin of the optic disc in the human eye.

Macula

A small central area of the retina responsible for sharp, detailed vision, particularly critical for tasks like reading and driving.

Papilledema

Swelling of the optic disc due to increased intracranial pressure, which can be observed through an eye examination and may indicate serious medical conditions.