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Identify the trimester when each fetal development finding occurs.

Select the appropriate trimester for each finding:

A.

Formation of fingers, toes, and facial features

B.

Fetus can hear and respond to external stimuli

C.

Increase in body fat reserves

D.

Brain develops most rapidly during this time

E.

Gender can be determined

Answer and Explanation

The Correct Answer is {"A":{"answers":"A"},"B":{"answers":"B"},"C":{"answers":"C"},"D":{"answers":"C"},"E":{"answers":"B"}}

A. Formation of fingers, toes, and facial features

Correct Trimester: 1st Trimester (Conception – 13 weeks)
Explanation:
By the end of the 1st trimester, organogenesis (organ formation) is largely complete.

  • Weeks 7–8: Limb buds appear and begin differentiating into arms and legs.

  • Weeks 9–12: Fingers, toes, facial features (eyes, nose, lips, ears) become clearly defined.
    This is a critical period for congenital malformations if exposed to teratogens.

B. Fetus can hear and respond to external stimuli

Correct Trimester: 2nd Trimester (14–26 weeks)
Explanation:

  • Around 18–20 weeks: The fetus develops the ability to hear sounds.

  • External sounds can startle the fetus, and the heartbeat may change in response.

  • Mother's voice and music can be recognized at this stage.

C. Increase in body fat reserves

Correct Trimester: 3rd Trimester (27–40 weeks)
Explanation:

  • In the final trimester, especially after week 32, fat accumulates under the skin.

  • This provides energy and helps with temperature regulation after birth.

  • The fetus also gains the most weight during this period.

D. Brain develops most rapidly during this time

Correct Trimester: 3rd Trimester (27–40 weeks)
Explanation:

  • Although brain development starts early, the most rapid growth occurs in the third trimester.

  • There's a dramatic increase in brain volume, cortical folding, and neural connectivity.

  • This trimester is essential for cognitive and motor development.

E. Gender can be determined

Correct Trimester: 2nd Trimester (14–26 weeks)
Explanation:

  • By week 18–20, an ultrasound can reliably show external genitalia.

  • The sex organs begin forming in the 1st trimester, but become distinct and visible by the 2nd trimester.

  • This is when many parents find out the baby's gender via an anatomy scan.


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Related Questions

Correct Answer is ["A","B","E"]

Explanation

Choice A rationale

Weight gain is a common side effect of corticosteroids due to fluid retention and increased fat deposition. Corticosteroids stimulate appetite and alter fat metabolism, leading to central obesity and moon face, which are classic findings.

Choice B rationale

Mood changes, including irritability, depression, or euphoria, are linked to corticosteroid therapy as these medications affect the central nervous system. Neuropsychiatric symptoms can vary widely and may impact the adolescent’s quality of life and social interactions.

Choice C rationale

Weight loss is not a typical side effect of corticosteroids. These medications are more associated with increased appetite and fat redistribution, leading to weight gain rather than weight loss, making this an incorrect choice.

Choice D rationale

Chronic fatigue is not directly attributed to corticosteroids. While muscle weakness can occur due to protein catabolism, it is not synonymous with fatigue. Corticosteroids often cause insomnia, which could indirectly lead to tiredness, but this is not a primary effect.

Choice E rationale

Osteoporosis is a long-term side effect of corticosteroids due to their impact on calcium metabolism and bone resorption. These medications decrease calcium absorption, increase calcium excretion, and suppress osteoblast activity, leading to reduced bone density.

Correct Answer is A

Explanation

Choice A rationale

Weight gain is a common side effect of corticosteroids, which alter metabolism and promote fluid retention. This effect can be pronounced in patients with muscular dystrophy, as corticosteroids are used to slow disease progression but may lead to unwanted changes in body composition.

Choice B rationale

Mood changes are another potential side effect of corticosteroids. These medications can affect neurotransmitter regulation in the brain, resulting in mood swings, irritability, or even more serious psychiatric effects such as depression or anxiety.

Choice C rationale

Chronic fatigue is not a primary side effect of corticosteroids. While muscular dystrophy itself may cause fatigue due to muscle wasting and decreased activity, the corticosteroids typically do not directly contribute to this symptom.

Choice D rationale

Osteoporosis is a long-term side effect of corticosteroid use, as these medications can interfere with calcium absorption and bone metabolism. Prolonged use may weaken bones, increasing the risk of fractures, especially in growing adolescents.

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