When does oogenesis begin?
During pubarche
During embryonic development
During thelarche
At birth
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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Correct Answer is B
Explanation
A. Mucosa (mucous membrane): The mucosa is the innermost layer of the digestive tract, not the outermost. It includes the epithelium, lamina propria, and muscularis mucosae.
B. Serosa (mesentery): The serosa is the outermost layer of the digestive tract in parts where it is covered by peritoneum. It consists of a thin layer of areolar tissue topped by simple squamous epithelium.
C. Muscularis externa: The muscularis externa is a layer of muscle in the digestive tract, located beneath the serosa. It is not the outermost layer.
D. Submucosa: The submucosa is a layer of connective tissue located between the mucosa and muscularis externa. It is not the outermost layer.
Correct Answer is D
Explanation
A. Sodium, potassium, carbohydrates, lipids, and proteins: Sodium and potassium are micronutrients, not macronutrients.
B. Carbohydrates, lipids, proteins, and water: Carbohydrates, lipids, and proteins are macronutrients, but water is not classified as a macronutrient. This option is partially correct but includes water, which is not a macronutrient.
C. Nucleic acids, carbohydrates, lipids, and proteins: Nucleic acids are not classified as macronutrients; carbohydrates, lipids, and proteins are.
D. Carbohydrates, lipids, and proteins, but not water: Carbohydrates, lipids, and proteins are macronutrients, and excluding water is correct since water is not a macronutrient.