What is the relation between bio psychology and the

This preview shows page 7 - 10 out of 16 pages.

1.2 What Is the Relation between Bio-psychology and the Other Disciplines of Neuroscience?
Chapter 10: Reproductive Behaviours Sex and hormones Male and female start w the same anatomy: o Mullerian ducts –female internal structure o Wolffian ducts – male internal structure As well as undifferentiated gonads: testes and ovaries o Testes – sperm producingAndrogens – hormones that increase growth of testesProduces MIH (mullerian inhibiting hormone)SRY gene – sex determining region on Y chromosomeo Ovaries – females egg producing organs Do not produce MIH Estrogen – female hormone Steroid hormones – hormones that contain four carbon rings o Bind to membrane receptors o Enter cells and activate certain proteins o Bind to receptors that bind to chromosomes Testosterone – androgen chemical Estradiol – estrogen hormone Progesterone – prepares uterus for implantation of a fertilized ovum and maintains pregnancy Genes on the X and Y chromosomes also produce sex differences Same unisex structure o Internal same, external different Organizing effects of sex hormones Organizing effects – produce long lasting structural effects Sensitive period –sex hormones determine female/male genitals Activating effects –temporary; while hormone is present Sex differences in the hypothalamus
Sexually dimorphic nucleus – larger in males and contributes to control of male sexual behaviour Parts of a females hypothalamus generate a cyclic pattern of hormone release An enzyme found in the brain can aromatize testosterone into estradiol Alpha-fetoprotein – binds w estradiol and prevents from entering cell, where it can produce masculine effects Testosterone masculinizes the brain in one way or another Viagra increase release of nitric oxide into hypothalamus and penis Activating effects of sex hormones Levels of testosterone or estradiol exert activating effects, temporarily modifying behaviour Oxytocin – stimulates contractions and releases breast milk, experience state of relaxation Males: o Testosterone acts partly by increasing touch sensitivity in the penis o Sex hormones also bind to receptors that increase responses in parts of the

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture