IBCLC Maternal Physiology and Anatomy 3

Question 1

What is the average volume of colostrum produced per feeding in the first 24 hours after birth?

Accepted Answer

2-10 mL per feeding

Answer

30-60 mL per feeding

Answer

60-90 mL per feeding

Answer

Less than 1 mL per feeding

Question 2

The Feedback Inhibitor of Lactation (FIL) is a protein that plays a key role in milk production regulation. How does it function?

Accepted Answer

When milk accumulates in the alveoli, FIL slows the rate of milk synthesis by acting locally on the lactocytes

Answer

It stimulates more milk production when the breast is full

Answer

It circulates in the blood to coordinate production between both breasts equally

Answer

It prevents milk production entirely until the infant latches

Question 3

What is the significance of the fourth intercostal nerve in relation to breastfeeding?

Accepted Answer

It provides primary sensory innervation to the nipple-areolar complex, essential for triggering the neuroendocrine reflex arc

Answer

It controls the pectoral muscles used for positioning

Answer

It controls blood flow to the breast

Answer

It has no significance in lactation

Question 4

How does the composition change from colostrum to mature milk during the first two weeks postpartum?

Accepted Answer

Sodium and protein concentrations decrease while lactose and fat concentrations increase

Answer

Composition remains constant throughout lactation

Answer

Fat content decreases as milk matures

Answer

Protein concentration increases significantly in mature milk

Question 5

What is the mechanism by which stress can inhibit the milk ejection reflex?

Accepted Answer

Catecholamines released during stress inhibit oxytocin release and may constrict myoepithelial cells

Answer

Stress directly destroys prolactin in the bloodstream

Answer

Stress causes milk ducts to physically close

Answer

Cortisol permanently damages mammary tissue

Question 6

A mother has a history of breast augmentation with implants placed behind the pectoral muscle. What is the expected impact on her ability to breastfeed?

Accepted Answer

Subpectoral implants generally have minimal impact on breastfeeding as glandular tissue and ductal system are less likely to be disrupted

Answer

She will be completely unable to breastfeed

Answer

Implants always cause complete nerve damage

Answer

Breastfeeding is only possible if the implants are removed first