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NEET BIOLOGY > Human Reproduction > Flashcards

Human Reproduction Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

Male reproductive system is located in the……..region

A

pelvis

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2
Q

The scrotum helps in maintaining the low temperature of the testes………….lower than the normal internal body temperature necessary for spermatogenesis.

A

2–2.5o C

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3
Q

testis is……..shape, with a length of about…….and a width of about……..

A

oval.
4 to 5 cm.
2 to 3 cm.

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4
Q

Each testis has about…….. compartments called testicular lobules

A

250

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5
Q

Each lobule contains………highly coiled seminiferous tubules in which sperms are produced

A

one to three

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6
Q

The male sex accessory ducts include……/……/……/……

A

rete testis, vasa efferentia, epididymis and vas deferens

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7
Q

Sperm journey

A

Seminiferous tubules
Rete testis
Vasa efferentia
Epididymis (lct posterior surface of each testis)
Vas deferens (ascend to abdomen)
Urethra

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8
Q

The enlarged end of penis called the glans penis is covered by a loose fold of skin called………

A

foreskin

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9
Q

The male accessory glands include……/……/……

A

paired seminal vesicles,
a prostate and
paired bulbourethral glands

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10
Q

Each ovary is about………..in length and is connected to the pelvic wall and uterus by……..

A

2 to 4 cm.
ligaments

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11
Q

The……/……/……constitute the female accessory ducts.

A

oviducts (fallopian tubes), uterus and vagina

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12
Q

Each fallopian tube is about……..long

A

10-12 cm

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13
Q

Last part of the oviduct……..has a narrow lumen and it joins the uterus

A

isthmus

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14
Q

cervical canal alongwith vagina forms the……….

A

birth canal

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15
Q

The wall of the uterus has three layers of tissue:

A

perimetrium :external thin membranous,

myometrium :middle thick layer of smooth muscle, and

endometrium: inner glandular layer called

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16
Q

The female external genitalia include……/……/……/……/……

A

mons pubis,
labia majora,
labia minora,
hymen and
clitoris

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17
Q

The glandular tissue of each breast is divided into……… mammary lobes containing clusters of cells called…….

A

15-20

alveoli

18
Q

The spermatids are transformed into spermatozoa (sperms) by the process called……….

A

spermiogenesis

19
Q

After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called……….

A

spermiation

20
Q

The sperm………contains an elongated haploid nucleus

A

head

21
Q

The cap-like structure…………is filled with enzymes that help fertilisation of the ovum

A

acrosome

22
Q

The human male ejaculates about…………sperms during a coitus

A

200 to 300 million

23
Q

Normal fertility, at least………….% sperms must have normal shape and size and at least…….% of them must show vigorous motility.

A

60 per cent

40 per cent

24
Q

The functions of male sex accessory ducts and glands are maintained by the………….

A

testicular hormones

25
Q

At puberty only……………. primary follicles are left in each ovary.

A

60,000-80,000

26
Q

Tertiary follicle is characterised by a fluid filled cavity called………

A

antrum

27
Q

Statement 1:Primary oocyte within the tertiary follicle grows in size and completes its first meiotic division.
Statement 2: It is an equal division resulting in the formation of a haploid secondary oocyte and a first polar body

A

Statement 1 is correct but 2 is incorrect
Statement 2: It is an unequal division resulting in the formation of a large haploid secondary oocyte and a tiny first polar body

28
Q

Primary oocytes are temporarily arrested at…………stage of prophase 1

A

Diplotene

29
Q

Secondary oocyte is arrested at ………….. stage

A

Metaphase 2

30
Q

Mitotic division starts as the zygote moves through……….. called as………..

A

Isthmus
Cleavage

31
Q

Embryo with 8 to 16 blastomeres is called…….

A

Morula

32
Q

After implantation finger like projections appear on ………… called …………..

A

Trophoblast
Chorionic villi

33
Q

Structural and functional unit between developing embryo and maternal body is called………..

A

Placenta

34
Q

Statement 1: Placenta acts also as endocrine tissue
Statement 2: It produces hCG, hPL and relaxin but no oestrogen

A

Statement 1 is correct and 2 is incorrect
It secretes produces several hormones like human chorionic gonadotropin (hCG), human placental lactogen (hPL), estrogens, progestogens. It doesn’t secrete relaxin, in the later phase of pregnancy, a hormone called relaxin is also secreted by the ovary.

35
Q

Assertion: In addition, during pregnancy the levels of other hormones like estrogens, progestogens, cortisol, prolactin, thyroxine, etc., are increased several-folds in the maternal blood
Reason: It is essential for supporting the fetal growth, metabolic changes in the mother and maintenance of pregnancy.

A

Both are true and R is correct explanation of A

36
Q

Parturition is induced by complex ……….. mechanism

A

Neuroendocrine

37
Q

Signals for parturition originate from………….. & ……….. which induce mild uterine contractions called……………

A

Fully developed foetus and placenta
Foetal ejection reflex

38
Q

The uterine endometrium undergoes cyclical changes during the menstrual cycle.

Estrogen secreted during the pre-ovulatory phase of the menstrual cycle helps in the development of follicle.

hCG secreted by trophoblast cells helps in maintaining corpus luteum.

A

Statements 1 and 3 are correct and 2 is incorrect

39
Q

Following are the data given. Which of the following show healthy values
I: A count of 10 million sperms per ml of semen
II:60 percent sperms have normal shape and size
III: 60 percent sperms show vigorous motility

A

Statements 2 and 3 are correct

40
Q

Statement I: During the menstrual cycle, progesterone would
be at its highest levels just prior to ovulation.
Statement II:During the menstrual cycle, the endometrium
would be at its thickest just after ovulation.

A

Both the statements are incorrect

NEET BIOLOGY (13 decks)

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