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Lecture 5

PSYC 250 Lecture Notes - Lecture 5: Vas Deferens, Breast Pain, EclampsiaPremium

12 pages46 viewsSpring 2018

Department
PSYC
Course Code
PSYC 250
Professor
Sara Radtke
Lecture
5

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The Biology of Sex, Pregnancy, and Childbirth
Chapter 5
Studying Sexual Response
- Sexual activity is driven by many factors, including hormones and neurotransmitters.
Hormones and Neurotransmitters
- Hormones and neurotransmitters both have powerful effects on our bodies
o Chiefly through hormones and neurotransmitters
o Neurotransmitters have an enormous effect on sexual behaviour
Masters and Johnson’s Sexual Response Cycle
Sexual Response
- The series of physiological and psychological changes that occur in the body during
sexual behaviour
- Masters and Johnson’s sexual response cycle
o The best- known biological model
- Proposed a four-phase model of physiological arousal known as the sexual response
cycle, includes:
1. Excitement
2. Plateau
3. Orgasm
4. Resolution
Real Research
- Although orgasms experienced during masturbation are:
o More physiologically intense than orgasms during partner sex
- Orgasms during masturbation provides
o Less overall sexual satisfaction than orgasms experienced during partner sex
Sexual Response Cycle in Men
- The sexual response cycle in males is similar to that of females
o Vasocongestion and myotonia cause physiological changes in the body
- Excitement Phase
o Tumescence
The swelling of the penis because of vasocongestion, causing an
erection
o Detumescence
The return of an erect penis to the flaccid state
- Orgasm Phase
o Ejaculatory inevitability
o A feeling that ejaculation can no longer be controlled
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Fertility
- Our bodies are designed to promote pregnancy
- A woman’s sexual desire peaks
- A mucus plug in the cervix disappears and cervical mucus thins, which assists sperm
to move through the cervix
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Conception
- Many sperm are killed by the female’s immune system
- The ovum can live for 24 hours and sperm can live for 72 hours
- Only one sperm fertilizes an ovum
o It secrets a chemical that makes a hole in the ovum coating
o Immediately the ovum coating changes and does not permit further sperm
from entering
- Fertilization takes about 24 hours, usually in the ampulla
- About 12 hours after fertilization;
o The first cell division occurs
o The blastocyst divides every 12 to 15 hours as it travels toward the uterus
- After implantation:
o The blastocyst divides into two layers, the endoderm and ectoderm, followed
shortly by the mesoderm
- Embryo: Developing cell mass of 2-8 weeks
o Multiple births occur in 1 out of 50 couples
- Monozygotic
o Identical twins
o Single zygote divides into two separate zygotes
- Dizygotic
o Pertaining to or derived from two separate zygotes
- Siamese Twins
o Fail to completely separate
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