ANA/HIST-C BREASTS

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Questions and Answers

What is responsible for activating the secretion of milk in lactating mammary glands?

  • Colostrum
  • Prolactin (correct)
  • Progesterone
  • Estrogen

Which type of cells are partially surrounded by a meshwork of myoepithelial cells in the acini?

  • Epithelial glandular cells (correct)
  • Secretory cells
  • Endothelial cells
  • Fibroblasts

What is the protein-rich fluid that engorges the breasts in preparation for newborns?

  • Lactose
  • Colostrum (correct)
  • Milk proteins
  • Secretory IgA

Which organelle is abundant in the secretory cells of lactating mammary glands?

<p>Rough endoplasmic reticulum (C)</p> Signup and view all the answers

What type of cells are indicated by the arrows in the higher magnification of an active mammary gland?

<p>Plasma cells (B)</p> Signup and view all the answers

What type of cells become cuboidal with nuclei positioned at the basal cell surface in the third trimester?

<p>Epithelial glandular cells (B)</p> Signup and view all the answers

What stimulates the proliferation of lactiferous duct components during the proliferative phase?

<p>Estrogen (B)</p> Signup and view all the answers

Which type of epithelium lines the lactiferous ducts?

<p>Stratified squamous (keratinized) epithelium (A)</p> Signup and view all the answers

Which cells are nonfunctional in the mammary gland?

<p>Myoepithelial cells (A)</p> Signup and view all the answers

During which phase do women perceive tenderness and a progressive increase of breast tissue mass?

<p>Luteal phase (B)</p> Signup and view all the answers

What characterizes the first trimester of development during pregnancy in relation to mammary glands?

<p>Branching of the terminal ductules (D)</p> Signup and view all the answers

Which cells infiltrate the intralobular connective tissue stroma during pregnancy?

<p>Plasma cells (A)</p> Signup and view all the answers

Which pathway involves exocytosis of milk protein and lactose in Golgi-derived secretory vesicles?

<p>Pathway II (D)</p> Signup and view all the answers

What is the main function of plasma cells?

<p>Production of Immunoglobulin A dimers (D)</p> Signup and view all the answers

Which cell process involves the secretion of ions and water across the apical membrane?

<p>Exocytosis of milk protein and lactose (C)</p> Signup and view all the answers

What type of pathway involves the paracellular transport of plasma components and leukocytes?

<p>Pathway V (B)</p> Signup and view all the answers

In what organelle are milk protein and lactose exocytosed before secretion?

<p>Secretory vesicle (B)</p> Signup and view all the answers

Which process involves pinocytosis and exocytosis of immunoglobulins?

<p>Exocytosis of milk protein and lactose (A)</p> Signup and view all the answers

Plasma cells are abundant in the lactating mammary glands.

<p>False (B)</p> Signup and view all the answers

The myoepithelial cells partially surround the cuboidal acinar cells in the mammary glands.

<p>True (A)</p> Signup and view all the answers

The terminal duct-lobular unit looks different during lactation compared to non-pregnancy.

<p>True (A)</p> Signup and view all the answers

Hypertrophy of secretory cells contributes to breast enlargement during pregnancy.

<p>True (A)</p> Signup and view all the answers

The main function of plasma cells in lactating mammary glands is to secrete milk proteins.

<p>False (B)</p> Signup and view all the answers

Oxytocin triggers the contraction of myoepithelial cells surrounding alveoli.

<p>True (A)</p> Signup and view all the answers

Colostrum is secreted from mammary glands on the 4th day after birth.

<p>False (B)</p> Signup and view all the answers

Milk composition includes 2% lipids.

<p>False (B)</p> Signup and view all the answers

Lactogenesis stage II occurs as progesterone levels rise after delivery of the placenta.

<p>False (B)</p> Signup and view all the answers

Water makes up 87% of milk composition.

<p>True (A)</p> Signup and view all the answers

Lactogenesis stage III marks an indefinite period of milk production known as galactopoiesis.

<p>True (A)</p> Signup and view all the answers

Lactose constitutes 7% of milk composition.

<p>True (A)</p> Signup and view all the answers

Immunoglobulin A provides temporary passive defense before infants develop their secretory IgA.

<p>True (A)</p> Signup and view all the answers

During lactogenesis, prolactin and human placental lactogen are essential hormones for alveolar development.

<p>True (A)</p> Signup and view all the answers

The milk ejection reflex involves the expression of milk from alveoli to ducts.

<p>True (A)</p> Signup and view all the answers

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