Class Notes (838,343)
Canada (510,861)
Biology (1,000)
BI459 (12)
Lecture 11

BI459 Lecture 11: BI459 Exam Review - Lecture 11

2 Pages
27 Views
Unlock Document

Department
Biology
Course
BI459
Professor
veronicamonclavo
Semester
Winter

Description
Lecture 11: Reproduction Part I Reproduction Overview - Reproduction is influenced by environmental variables that are perceived and integrated by the central nervous system - Communication between endocrine and nervous system via the HPG axis o Coordination of specific gonadal events through regulation by circulating gonadotropins (FSH & LH)  FSH  control of gametogenesis (oogenesis in females and spermatogenesis in males)  LH  mainly responsible for controlling androgen synthesis as well as release of gametes in both sexes - The gonadal axis is modified by other systems, especially the HPT and the HPA axes Sexual Differentiation - Genetic vs. Environmental - Involves development of genital system o Gonads (gametes, endocrine function) o Sexual Duct Systems o External Genitalia o (At Puberty) Secondary Sexual Characteristics such as Breast Development and Hair Patterns - Environmental factors may affect/override genetic gender - Male phenotype involves hormones produced by testis - Female phenotype develops in the absence of these male influences AND required the expression of specific genes o Active expression Male Reproductive System - Components o Testes (sex hormones, gametogenesis) o Ducts o Accessory Glands o External Genitalia (Penis + Scrotum) - Functions o Production of spermatozoa by spermatogenesis o (Endocrine) Production of Androgens (Male Sex Hormones) Testis – Sertoli Cells - Support and nourish cells of seminiferous tubule – forms blood testis barrier - No vasculature inside tubule so Sertoli cells transport nutrients to luminal region - Phagocytose cast-off cytoplasmic droplets from spermatids - Secrete fluid into lumen that helps sperm flow in tubules - Exocrine: secrete androgen-binding protein (ABP) - Endocrine: secretes inhibin + Mullerian inhibitory substance (MIH) Leydig Cells - Found in testes  between seminiferous tubules th - Become recognizable during the 8 week and soon begin to synthesize androgenic hormones  testosterone a
More Less

Related notes for BI459

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit