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When does oogenesis begin?

A.

During pubarche

B.

During embryonic development

C.

During thelarche

D.

At birth

Answer and Explanation

The Correct Answer is B

A. During pubarche: Pubarche refers to the onset of puberty, but oogenesis (the formation of oocytes) begins much earlier, during embryonic development.

 

B. During embryonic development: Oogenesis begins during embryonic development when the female fetus's ovaries form and start producing primary oocytes. These oocytes remain in a suspended state until puberty.

 

C. During thelarche: Thelarche is the onset of breast development during puberty, but oogenesis starts long before this, during embryonic development.

 

D. At birth: While primary oocytes are present at birth, the process of oogenesis actually begins during embryonic development, not at birth.
 


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View Related questions

Correct Answer is A

Explanation

A. Na+: Sodium (Na+) is the principal cation in the extracellular fluid (ECF), which includes interstitial fluid and blood plasma.

B. Ca2+: Calcium (Ca2+) is important in various bodily functions but is not the principal cation in the ECF. Sodium is more predominant in ECF.

C. Cl-: Chloride (Cl-) is the principal anion in the ECF, not a cation. Sodium is the principal cation.

D. K+: Potassium (K+) is the principal cation in the intracellular fluid (ICF), not the ECF. Sodium is the principal cation in the ECF.

Correct Answer is C

Explanation

A. Lactose is a sugar in breast milk and is not the only source of nutrition during the first 2-3 days postpartum.

B. Casein is a protein found in breast milk but not the sole source of nutrition for the infant.

C. Colostrum is the nutrient-rich first milk produced by the mother in the first 2-3 days postpartum and provides essential nutrients and antibodies to the newborn.

D. Meconium is the infant's first stool and not a source of nutrition.

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