Lec 10

Question 1

What % of American adults identify as lesbian, gay or bisexual?

Answer 1

3.5%

Question 2

What % are asexual?

Answer 2

1%

Question 3

How much higher is homosexuality in siblings than in the general population?

Answer 3

2-7 times

Question 4

The more ____ a man has from the same mother, the greater the probability he will be homosexual.

Answer 4

The more older brothers

Question 5

Male homosexuals and heterosexuals have _____ _____ testosterone levels.

Answer 5

The same

Question 6

Any hormonal influence on male homosexuality likely occurs _____.

Answer 6

Prenatally

Question 7

What are the three components that have to do with sexual orientation?

Answer 7

1. Bed nucleus of the stria terminalis
2. Sexually dimorphic nucleus (INAH3)
3. Suprachiasmatic nucleus

Question 8

What is smaller in gay man than in heterosexual men?

Answer 8

INAH3- it is female sized

Question 9

________ is larger in gay men than in heterosexual men. Also contains more vasopressin-secreting cells

Answer 9

Suprachiasmatic nucles (SCN)

Question 10

______ is larger in gay men and heterosexual women than in heterosexual men.

Answer 10

Anterior commisure

Question 11

Gay mens verbal spatial performance is _______ than to heterosexuals mens.

Answer 11

More similar to womens

Question 12

________ hemisphere in both homosexual females and heterosexual males.

Answer 12

Larger right hemispheres

Question 13

________ hemispheres in both homosexual males and heterosexual women.

Answer 13

Symmetric

Question 14

When does estrogen rise?

Answer 14

Estrogen rises before ovulation

Question 15

What is it called when a female is sexually receptive?

Answer 15

Estrus (but not in human females)

Question 16

When is there an increase in female initiated sex?

Answer 16

At ovulation

Question 17

What is necessary for male copulation?

Answer 17

Androgens, but does not apply to human males

Question 18

Both women and men have 4 things in their sexual response curve

Answer 18

1. Excitement phase (arousal)
2. In plateau, arousal levels off
3. Orgasm (ejaculation)
4. Resolution, as arousal falls and body returns to normal

Question 19

What do women not have in their curve?

Answer 19

Refractory phase

Question 20

PET scan shows that what is released during ejaculation?Where was the primary activation?

Answer 20

Oxytocin

Primary activation was in the ventral tegmental area

Question 21

During female orgasm in PET scan there is activation of what and inhibition of what?

Answer 21

Activation of the deep cerebrellar nuclei

Inhibition of orbitofrontal cortex

Question 22

What is involved in sex, smell, aggression, and emotion?

Answer 22

Medial amygdala

Question 23

What is involved in sexual performance? One subarea is larger in whom?

Answer 23

Medial Preoptic Area

Males

Question 24

What are the important brain areas for sex for men?

Answer 24

Sexually dimorphic nucleus-
Male sexual activity is related to is size
Paraventricular nucleus (PVN)- male sexual performance/erection, signals to secrete oxytocin

Question 25

What is the important brain area for females during sex?

Answer 25

Ventromedial hypothalamus-receptivity to male advances, in the mood

Question 26

What is the SRY gene?

Answer 26

Sex determining region on Y chromosome-is responsible for development of testes. Without it ovary forms

Question 27

What is the main organizing hormone in human brain development?

Answer 27

Testosterone

Question 28

What is guevedoces?

Answer 28

Penis at 12, deficiency in an enzyme 5-a-reductase

Question 29

What is Klinefelter Syndrome-XXY?

Answer 29

Low levels of testosterone