Lec17 Endocrine System

Lec17 Endocrine System - Chapter 15 Endocrine System...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 15 Endocrine System
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Endocrine system Mostly comprised of glands Secretes hormones that move through the bloodstream to target cells Results in a slow but a prolonged response
Background image of page 2
Endocrine system
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What is a target cell?
Background image of page 4
Exocrine vs. endocrine glands Exocrine glands secrete their products into ducts that carry these products to other organs or outside the body Endocrine glands secrete their products directly into the bloodstream
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What are hormones? Hormones are chemical signals that promotes communication between cells, body parts and even individuals Hormones: Prostaglandins : local hormones affect neighboring cells and thus are not carried in the bloodstream Pheromones : chemical signals that influence the behavior of other individuals Peptide hormones : bind to a receptor in the plasma membrane causing the formation of cAMP which activates a cascade of enzymes Steroid hormones : lipids that enter a cell and affect gene activity and thus protein synthesis
Background image of page 6
Action of peptide hormones
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Action of steroid hormones
Background image of page 8
Major glands of the endocrine system 1. Hypothalamus 2. Posterior pituitary gland 3. Anterior pituitary gland 4. Thyroid gland 5. Parathyroid glands 6. Adrenal glands 7. Pancreas 8. Testes 9. Ovaries 10.Thymus gland 11.Pineal gland
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1. Hypothalamus Regulates internal environment through the autonomic nervous system Helps control heartbeat Helps control body temperature Helps control water balance Controls glandular secretions
Background image of page 10
2. Posterior pituitary gland Stores antidiuretic hormone (ADH) and oxytocin that are produced by the hypothalamus ADH : regulates water balance by reabsorbing water into the bloodstream Oxytocin : causes uterine contractions during childbirth and allow milk to be released during nursing
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3. Anterior pituitary gland Controlled by hypothalamic-releasing and hypothalalmic-inhibiting hormones Hormones produced by the anterior pituitary: 1. Thyroid-stimulating hormone (TSH): stimulates the thyroid to produce thyroid hormones 2. Adrenocorticotropic hormone (ACTH): stimulates the adrenal cortex to produce cortisol 3. Gonadotropic hormones : stimulate gonads to produce sex cells and hormones 4. Prolactin (PRL): stimulates mammary glands to develop and produce milk only after childbirth
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2009 for the course BIOL 115 taught by Professor Irving during the Spring '08 term at Illinois Tech.

Page1 / 39

Lec17 Endocrine System - Chapter 15 Endocrine System...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online