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Lab animal > A&P for mice and rats > Flashcards

A&P for mice and rats Flashcards

1
Q

rats and mice have tails that are longer than their body length

A

true

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2
Q

rats have a gallbladder

A

false

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3
Q

the inguinal canal in males remains open throughout life

A

true

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4
Q

mice and rats typically breed during daylight hours

A

false

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5
Q

secretions from the harderian gland in rats is commonly called

A

red tears

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6
Q

what is brown fat commonly called and where is it located?

A

hibernation tissue and it is located diffusely around the neck and between the scapulae

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7
Q

how much does the hibernation tissue provides energy storage than other types of fat?

A

10 times

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8
Q

Gestation for mice/rats

A

mice: 19-21 days
rats: 21-23 days

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9
Q

when do mice reach puberty? when do rats reach puberty

A

mice: 35 to 50-60 days
rats: females- 37 to 67 days
males- 40-75 days

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10
Q

what is the average lifespan of mice and rats?

A

mice: 1-3 years
rats: 2-4 years

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11
Q

normal TPR for mice?

A

98.6F, HR: 427-697bpm, RR: 91-216bpm

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12
Q

normal TPR for rats?

A

98.6F, HR: 313-493bpm, RR: 71-146bpm

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13
Q

how many digits do rats and mice have on the forelimbs and hind limbs?

A

4 digits in the forelimbs and 5 digits in the hindlimbs

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14
Q

how many pairs of mammary glands do female rats have and where are they found?

A

4-6 pairs and found in the thoracic and inguinal areas

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15
Q

how many pairs of mammary glands do female mice have and where are they found?

A

5 pairs and extend to the sides and back

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16
Q

do male mice have mammary glands?

A

yes

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17
Q

the uterus of mice and rats is considered

A

bicornuate

18
Q

what do each uterine horn have seperately

A

cervical canal

19
Q

what type of ovulators are mice and rats? what type of estrus cycle do they have? How long does their estrous period last?

A

spontaneous ovulators. they are continously polyestrus and it lasts 4-5 days

20
Q

in mice and rats the postpartum estrus occurs when?

A

20-24 hours after parturition

21
Q

the presence of a copulatory plug can be used to confirm

A

mating

22
Q

what type of teeth do mice and rats have?

A

hysodontic

23
Q

the direct result of mating between two different inbred strains

A

hybrid

23
Q

develop as a result of genetic mutation in existing strains. The mutation is then carried on in future generations

A

coisogenic

24
Q

strains are those in which a mutation that arises in one strain is transferred to another strain through a series of backcross mating. this is how nude animals were developed.

A

congenic

25
Q

a mouse whos DNA has been modified so that is does not express particular proteins

A

stock

26
Q

why do rats have the inability to vomit

A

the gastroesophageal barrier

27
Q

describe the unique structures of the rats lungs

A

left side is small and singular while the right side is larger and divided into 4 sections

28
Q

what is chromodacryorrhea? When does it commonly occur?

A

It is red tears which are known as bloody tears. It occurs when the animal is stressed

29
Q

what is the purpose of tails in mice and rats?

A

it functions as balance and a mechanism for heat loss

30
Q

describe the pancreas in rats

A

diffuse, has a lot of ducts that empty into the intestines

31
Q

what is a copulatory plug, and how long does it remain in place?

A

it is a plug that is dried semen mixed with secretions from the vagina and confirms mating It remains in place for 12-24 hours after mating

32
Q

what is an intestive breeding program for mice and rats?

A

continuous housing of the male and females

33
Q

what is a non-intensive breeding program for mice and rats

A

seperate housing the male and female while the female is pregnant

34
Q

what is the bruce effect?

A

a pregnant mouse who is exposed to a new male within 4 days of breeding, the pregnancy will be aborted

35
Q

what is the whitten effect?

A

when females are exposed to a male or the odor of a male. they will begin estrus within 3 days

36
Q

what is a stock breed animal?

A

type of mouse/rat that has been randomly bred. Not imbred

37
Q

when is an inbred animal considered a strain?

A

at least 20 generations of brother-sister or parent have mated

38
Q

what are 5 ways to ensure genetic purity in inbred mice?

A

protein electrophoresis, serologic testing, mandible measurements, backcross mating, and tissue transplants

39
Q

what is a transgenic animal?

A

when a animal carries a foreign gene that has been deliberately inserted into ints genome

40
Q

why do we use so many mice and rats in animal research?

A

they have a well characterized genetic make-up

Lab animal (5 decks)

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