Exam 4 Part 7 Flashcards Preview

Biology 150 > Exam 4 Part 7 > Flashcards

Flashcards in Exam 4 Part 7 Deck (19):
1

urethra

retroperitoneal tube: smooth muscle; urninary bladder to outside
2 sphincters
female: short, straight, single function
Male: longer, S-shaped, transports both urine and semen

2

Urethra sphincters

internal urethral sphincter
external urethral sphincter

3

internal urethral sphincter

involuntary muscle; superior, formed from detrusor muscle of bladder

4

external urethral sphincter

inferior, voluntary muscule

5

ovaries

2 - anchored to pelvic cavity by CT

6

ovarian cycle at birth

human female has all oocytes will ever have; meiosis has begun but not completed (Prophase I)
these are all primary oocytes ( within primordial follicle)
many regress before puberty

7

ovarian cycle at puberty

hormones stimulate follicles to grow
each month, approx. 20 follicles grow, because primary follicles and produce estrogen
estrogen prepares uterus for possible pregnancy
a few of these 1o follicles to become 2o follicles
one 2o follicle becomes vesicular follicle, others regress
the oocyte within this folllicle completes meiosis I and is now a 2o oocyte-haploid- at Metaphase II

8

ovulation

follicle ruptures and releases 2o oocyte
occurs about 14 days into menstrual cycle
2o oocyte released to peritoneal cavity near opening to uterine tube; is drawn into tube

9

ovum

sperm has fertilized oocyte, and meiosis completed

10

fertilization

nuclei of ovum and sperm fuse

11

implantation

about 1 week after fertilization\
zygote implants in uterus - start of pregnancy

12

corpus luteum

follicle after oocyte is released
regresses with no pregnancy
produces hormones to prevent ovulation during pregnancy

13

neopause

when no more follicles remain

14

accessory female sex organs

oviducts
fimbriae

15

oviducts

Fallopian tubes
connect to uterus (not attached to ovary)
smooth muscle contractions move oocyte along
sperm swim upstream against currents pulling oocyte
fertilization occurs here
diameter tiny

16

fimbriae

finger-like projects on oviduct
seep oocytes into tubes

17

uterus

womb
pear shaped, thick-walled, muscle, ligaments support
covered by broad ligament; intraperitoneal
zygote implants here
inferior portions narrows to form cervix
3 wall layers

18

broad ligament

covers uterus, CT

19

cervix

neck of uterus
connects to bagina, receives sperm
holds baby's head, dilates during birth
cancer of cervix detected via Pap smear