NPB010 Lecture 24 Reproduction PDF

"127 D B 010 Lecture 24 Repro # Continued : testes make gametes : sperm ↳- - - & head neck tail contains DNA ↓ b...

"127 D B 010 Lecture 24 Repro # Continued : testes make gametes : sperm ↳- - - & head neck tail contains DNA ↓ b mitochondria swimming to generate energy for swimming contains to acrosome help it enter the enzymes egg Associated with testes is penis with at the end glans penis , a nerve rich area that help with orgasm => to shoot out speim & help them on their way  ② - a scrotum (ball sack) houses testes. Sperm develop less well at 370 or higher , so scrotum hangs outside body for cooler temperatures. ↳ so loose underwear is better b hottubs of sperm reduce qua as well lity  ⑤ ·glans stores I epididymus erectile disseelood peniscantil sperm I a Y seminiferous tubules that produce sperm * we can cut here for vasectomy to prevent sperm from exiting.  is mixed with secretions ④ Sperm from Seminalrecent3 gland helps Sperma I water firctose/glucose > - energy mous > - sticky bicarbonate HCO acidity - > - reduces - H+ I + HCO-H2CO H20 + 12 causes acidity Why alkaline (opposite of acidic) => Vagina is acidic (to prevent infection) & we need neutralize PH Back to testosterone ⑤ ↳ made from cholesterol b fatty molecule ↳ allows it to ⑪ enter cells freely binds to a receptor inside the cell together they go , into the nucleus & changes cause in gene expression ⑪ can have major effects on body Tuberly/ testosterone levels => voice drops - facial hair i -body hair i arms , chest back , - broader chested , more muscular - long behavior bones stop growing : fi reach nat - changes Adults) testosterone & levels stable - maintain muscle/bone - 1 Sexprive -helps with sperm formation #e age) slow drop in testosterone => harder to maintain bone/muscle How can maintain stable levels of testosterone Hypothalamus - secretesguRH ↑ ly gonadotropin Releasing i·nhibiary ②activation hormone - secrets & [ LH hormone inhibits = luteinizing follide FSH = stimulating hormones /activation Testes > one of the things that happen secretes #testosterone hormone a performs its => = negative feedback testosterone job in body keeps stable An issue that often with comes age -rectile dysfunction ↳ penis can not become stiff, or not long enough Pretty common => due to blood vessel issue e. g. prostate enlarges & presses on blood vessels incoming arterioles e with diabetes we see blood g.. vessel damage - Viagra intended as blood pressure med ↳ relaxes the smooth muscle around afferent arterioles that bring blood in > allowing more blood to arrive in penis