Question

what process occurs during week 5 of human embryonic development?

a eyes start to form
b blood begins to circulate
c leg buds appear
d all of the above

Explanation:

Analyze the embryonic stage timeline

Using the Embryonic Stage knowledge point, week 5 of human development (gestational week 5, or embryonic week 3) is a period of rapid organogenesis.

Evaluate individual developmental events

Using the Organogenesis Timeline knowledge point, we examine each option:

• Eyes start to form: Optic cups and lens pits begin developing.
• Blood begins to circulate: The primitive heart tube begins beating and circulating blood.
• Leg buds appear: Limb buds (both arm and leg buds) become visible.

Determine the correct choice

Since all three processes occur during week 5, option d is correct.

Answer:

• a eyes start to form
• b blood begins to circulate
• c leg buds appear
• d all of the above (Correct answer)