Sexual Behavior

Question 1

Lordosis

Answer 1

Female exhibiting hind limb strength to support male hurdle

Question 2

Intromission

Answer 2

Process of inserting the penis into the vagina during sexual intercourse.

Question 3

Sexual behavior DOG (male + female). discuss intercourse behavior as well . also dismount behavior

Answer 3

Pheromones present in the urine + secretions of anal glands and vulva

Soliciting behavior then run away (female)
Mounting (male), female will allow

Male penis cannot withdraw. copulatory lock.
rear to rear dismount

Female vagina contract while penis eject prostatic fluid

Question 4

Sexual behavior (Ungulates). discuss male + female from prior to intercourse

Answer 4

(Horse)
Male:
- female in estrus release pheromone that is sensed by male nasopalatine duct. elicit freshmen response
-erection, mounting, intromission, ejaculation

Female

• Urine
• Mounting, female then male
• firm standing for mounting

Question 5

Define : Nasopalatine

Answer 5

the organ congruent with the vomeronasal duct. responsive to pheromones.

Question 6

After castration, males still express mounting behavior longer after intromission and ejaculation. why?

Answer 6

Motivational state (brain) sensory (generals)

Question 7

If eliminate testosterone, how can you rescue full male reproductive behavior (PRIMATES)

Answer 7

Provide DHT + small amounts estradiol

Question 8

For male. what is response to absence of testosterone ? when given androgen? what is role of androgen?

Answer 8

Male still have sexual behavior in absence of testosterone. When given androgens, male behavior increases in freq.

Question 9

What is the man response to sexual encounter ?

Answer 9

-Acute androgen rise
-Uncoupling of frontal cortex from amygdala
=increased chance of risky behavior

Question 10

What is name of stage when NON primate female expresses sexual behavior? what does this stage identify

Answer 10

Estrus. This is at time of ovulation.

Humans have no estrus !

Question 11

What happens in terms of sexual behavior

when these females are ovariectomized

Answer 11

There is a prompt decrease int female RECEPTIVITY and PROCEPTIVITY.

Question 12

Define Receptivity (libido)

Answer 12

Receiving a male

Question 13

Proceptivity (libido)

Answer 13

Behavior that solicits male attention

Question 14

What happens when estradiol given to ovariwctomized female

Answer 14

rescue of receptivity and proceptivity

Question 15

How does estradiol change sexual attractiveness of female

Answer 15

Increase mixture of aromatic aliphatic acids produced from microbial action on the vaginal secretions

Question 16

How does the vagina turn on/off sexual interest in male.

Answer 16

increased levels of PROGESTERONE can decrease sex-attractant properties of vaginal secretions.

Note that some males are oblivious to changes in odor

Question 17

What are males attracted to in female? vice versa

Answer 17

Testosterone and estrogen

Question 18

Postmenopausal women do not usual suffer complete loss of libido. Define libido

Answer 18

Libido is proceptivity and receptivity of female.

Question 19

Define coital

Answer 19

Sexual intercourse

Question 20

Give 4 stages of Human Sexual response

Answer 20

1. excitement
2. Plateau
3. orgasm
4. resolution (cum)

Question 21

Explain the neuronal response in flaccid state. State whole pathway of each NT

Answer 21

Sympathetic Adrenergic neurons release NE , increases IP3&raquo_space; Ca+ , increase SM contraction/ constriction.

Ca binds calmodulin, cross bridge formation between actin & myosin = tension

Question 22

Explain the neuronal response in erect state. State whole pathway of each NT

Answer 22

parasymp. Cholinergic neuron release Ach= inhibit sympt. nueron. + increase cAMP, decrease Ca = no more tension

NO releasing neurons:
promote synthesis of cGMP 2nd messenger which promote uptake of Ca+ from cytosol (=decrease Ca).

Question 23

Define erectile tissues + arteries in male

Answer 23

Corpus cavernosa , corpus spongiosum, smooth muscle layers of the arteriolar and arterial walls

Question 24

Define sinusoid? How & why does play role in erection

Answer 24

The sinusoid is the cancerous tissue that fills with blood. fills from compression of venous plexuses and contraction of ischiocavernosus tissue.

=increase pressure and rigidity

Question 25

Stages of ejaculation.

activation, neuronal, response

Answer 25

Emission:
stimulation of penis> sympathetic innversation= contraction of epididymis, vas deferens, bladder neck
=release SV into urthera

Ejaculation:
SV enter urethra> parasympathetic> activation of rhythmic contraction> blulbaurthra muscle, ischiocavernosus, pelvic floor muscle
= release SV out of urethra.