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bio 100 exam 3

bio 100 exam 3

Description

School: Washington State University
Department: Biomed Engr/Joint
Course: General Biology
Professor: Lisa carloye
Term: Spring 2017
Tags: Biology
Cost: 50
Name: bio study guide exam 3
Description: exam 3 study guide... REVIEW YOUR NOTES
Uploaded: 03/29/2017
2 Pages 101 Views 0 Unlocks
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○ More water is reclaimed from filtrate and retained in body ● How do Hormones control reproduction in males?




● What happens during Homeostasis (alpha cells)?




● What happens during Homeostasis (beta cells)?



● What happens during Homeostasis (beta cells)? ○ Blood glucose levels go up  ○ Beta cells in pancreas activated and release insulin into  blood ○ Insulin ■ Negative feedback loop ○ Body cells take up more glucose ○ Liver takes up more glucose ■ Stores it aWe also discuss several other topics like ece466
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s glycogen ○ Liver ○ Blood glucose levels go down  ● What happens during Homeostasis (alpha cells)? ○ Blood glucose levels go down  ○ Pancreas ○ Alpha cells in pancreas activated and release glucagon  into blood ○ Glucagon ○ Liver breaks down glycogen releases glucose into blood ○ Blood glucose levels go up  ● What is ADH? What happens?  ○ Antidiuretic hormone ○ Dehydration stimulates releases of ADH from the  hypothalamus ○ Target tissue is the collecting duct of the nephrons  ○ When ADH is present, increases water permeability of  collecting duct ○ More water is reclaimed from filtrate and retained in body  ● How do Hormones control reproduction in males? ○ Tissues involved ■ Brain  ■ Testis ○ (negative feedback loop) hypothalamus → GnRH→  pituitary gland ○ (negative feedback loop) Pituitary gland → FSH→ testis →  spermatogenesis  ■ FSH→ spermatogenesis → inhibin  ○ (negative feedback loop) Pituitary gland → LH→ testis →  testosterone → spermatogenesis  ● How do Hormones control reproduction in females? ○ FIRST LOOP ■ hypothalamus → GnRH→ pituitary gland ■ Pituitary gland → FSH→ ovary (growing  follicles/egg) → estrogen (estradiol) → pituitary gland (negative  feedback loop.. At first  ■ Estrogen → estrogen peak stimulates LH  burst → pituitary gland (positive feedback loop)  ○ SECOND LOOP■ (negative feedback loop) Pituitary gland→  LH→ corpus luteum (follicle w/o egg) → progesterone and some  estrogen→ REPEAT WHOLE CYCLE  ● Cycle is about 28 days long ● What are the stages of embryonic development? ○ Step 1: fertilization creates a zygote ○ Step 2: zygote undergoes cleavage ○ Step 3: cells organize into 3 tissue layers  ○ Each tissue layer gives rise to distinct organ systems: ■ Inner tube= digestive system ■ Outer tube= integumentary system  ■ Middle layer= organ systems lying between  the gut and the skin: ● Circulatory system= vessels,  heart, blood ● Skeletal system ● Muscular system  ■ But NOT the nervous system  ○ Step 4: nervous system forms ■ Cells on dorsal side into a tube= the spinal  cord ○ Step 5: vertebrae and muscles form  ■ Cells form blocks of tissue along nerve chord ■ Tissue blocks specialize into vertebrae and  muscles  ● What are the stages of the nervous system? ○ Nerves connect in a network ○ Use an electrical signal to pass information along a single  nerve ○ Then use chemical signals to pass from the nerve to the  adjoining cell ○ Electric signal created by movement of charged atoms  (ions) ○ Ion concentration gradients create electrical differences  between inside and outside of nerve cell

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