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Physiology of Lactation
Chapter Quiz
1
Which mammal produces milk with the highest fat content?
A)
whale
B)
dog
C)
human
D)
cow
E)
horse
2
Which solid component has the greatest increase in cow's colostrum when compared to normal milk?
A)
lactose
B)
calcium
C)
vitamin C
D)
globulin
E)
iron
3
The mare has how many mammary glands?
A)
2
B)
4
C)
6
D)
8
4
The mammary glands of the mare and cow are in which area of the body?
A)
dorsal
B)
pectoral
C)
inguinal
D)
cranial
5
About what volume of blood passes through the udder of a cow for each volume of milk produced?
A)
3 to 5 times
B)
30 to 50 times
C)
300 to 500 times
D)
3,000 to 5,000 times
6
Venous blood leaves the cow's mammary tissue area primarily via the external pudic veins and what other route?
A)
lymph system
B)
aorta
C)
pulmonary arteries
D)
pulmonary veins
E)
subcutaneous abdominal veins
7
Which of the following are not present in the mammary system of the piglet when it is born?
A)
streak canal
B)
teat cistern
C)
gland cistern
D)
collecting ducts
E)
alveoli
8
The initiation of lactation is most closely related to what hormone?
A)
estrogen
B)
progesterone
C)
prolactin
D)
insulin
E)
parathyroid hormone
9
The regulation of blood calcium balance is most closely related to which hormone?
A)
estrogen
B)
progesterone
C)
prolactin
D)
insulin
E)
parathyroid hormone
10
What hormone is responsible for the "milk letdown" (ejection) response?
A)
oxytocin
B)
adrenalin
C)
prolactin
D)
progesterone
E)
estrogen
11
What cells are responsible for expulsion of milk from the alveolar units upon "milk letdown"?
A)
alveolar
B)
sustentacular
C)
sphincter
D)
myoepithelial
E)
satellite
12
Heritability for yield of milk components is quite low when compared to such traits as feed efficiency and average daily gain.
A)
TRUE
B)
FALSE
13
Although speed of milking can increase daily production in dairy cows, frequency of milking has no significant impact.
A)
TRUE
B)
FALSE
14
Only about 10 percent of milk fatty acids come from arterial blood while about 90 percent come from synthesis in the mammary gland.
A)
TRUE
B)
FALSE
15
The release of adrenal hormones is generally supportive of high levels of milk production.
A)
TRUE
B)
FALSE
16
Mammary growth, measured as production of new alveolar cells, stops at parturition in all species of mammals.
A)
TRUE
B)
FALSE
17
Alveolar cells are produced under the influence of estrogen and progesterone during pregnancy in horses.
A)
TRUE
B)
FALSE
18
Alveolar cells are specialized epithelial cells.
A)
TRUE
B)
FALSE
19
Milk fever is a term used to describe an infection of the mammary system.
A)
TRUE
B)
FALSE
20
The mammary gland is termed "merocrine" because parts of the gland’s cells are secreted along with milk.
A)
TRUE
B)
FALSE
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