100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Grade 12 IEB Life science/biology strand 2: (2.1) Human Endocrine System summary $4.49   Add to cart

Summary

Grade 12 IEB Life science/biology strand 2: (2.1) Human Endocrine System summary

1 review
 102 views  7 purchases
  • Course
  • Institution

This aesthetic, in-depth, neatly typed document summarises 2.1 of strand 2 of the IEB grade 12 mind action series textbook: The Human Endocrine System. it includes the full 2.1 Endocrine system syllabus as well as additional class and research notes.

Preview 2 out of 12  pages

  • November 29, 2022
  • 12
  • 2022/2023
  • Summary
  • 200

1  review

review-writer-avatar

By: karelconradie • 1 year ago

avatar-seller
ENDOCRINE SYSTEM
Chemical coordination: Slow, prolonged process of communicating information through body by

chemicals (hormones), secreted by endocrine glands



Hormone: Organic substance (protein/steroid) secreted by endocrine gland and carried in

bloodstream to target organ to regulate metabolic reactions.



Target Organ: Specific cells that respond to a given hormone and have receptor sites for that

hormone.



Endocrine gland: Vascular, ductless gland that secretes hormones carried in bloodstream to target

organs

• Exocrine gland: Secretions carried in ducts eg. liver, salivary glands

• Endocrine gland: No ducts; secretions carried in bloodstream to target organs eg. adrenal glands



Endocrine glands in the body:

, 1) Hypothalamus:

Part of brain, above pituitary gland. Secretes ADH (Anti-diuretic hormone)

• Osmoreceptors in blood vessels of hypothalamus detect increase in osmolarity (low water levels)

of blood

• Hypothalamus responds & releases ADH

• Helps to conserve water if body is dehydrated; causes more water to be reabsorbed into blood

from kidney (less water lost as urine)



2) Pituitary gland - 'master gland':

• Chemical co-ordinator of other endocrine glands

• Attached to hypothalamus by a short stalk

• Secretes:

- TSH (thyroid stimulating hormine): Stimulates thyroid to secrete thyroxin

- FSH (follicle stimulating hormone): Stimulates oogenesis in ovary & spermatogenesis in testis

- LH (luteinizing hormone): Stimulates ovulation from ovary & formation of corpus luteum

- Prolactin: Stimulates production of milk in mammary glands after birth

- ACTH (adrenocarticotropic hormone): Stimulates adrenal cortex to secrete cortisone and

aldosterone

- ICSH (interstitial cell stimulating hormone): Stimulates testis to secrete testosterone

- GH/STH (growth hormone/somatotrophic hormone): Promotes skeletal & muscular growth



Growth disorders:

• Hypersecretion: over secretion of hormone

• Hyposecretion: under secretion of hormone



• In prepubertal children:

- Hypersecretion of GH: Gigantism (caused by tumour in pituitary)

- Hyposecretion of GH: Pituitary dwarfism (can be treated with STH - synthetic growth hormone)

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Lindyprinsloo. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $4.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

73918 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$4.49  7x  sold
  • (1)
  Add to cart