Class notes

cie alevel biology chapter 14 homeostasis

2 views 0 purchase

Course
Chapter 14 - Homeostasis (BIO9700)

Institution
CIE

-personalized notes made with many keywords from the marking scheme for easy revision and solving past paper questions -got A for bi0logy AS and A2 -direct and easy to read and understand

[Show more]

Preview 2 out of 11 pages

View example

Uploaded on April 29, 2022
Number of pages 11
Written in 2020/2021
Type Class notes
Professor(s) -
Contains All classes

homeostasis
kidney structure
kidney function
kidney
urine formation
cie alevel
cie alevel biology
cie alevel biology 9700
alevel biology
alevel
biology
alevel biology 9700
biology notes
as biology not

Institution
CIE
Course
Chapter 14 - Homeostasis (BIO9700)

CA$7.67

Added

Add to cart

Add to wishlist

100% satisfaction guarantee
Immediately available after payment
Both online and in PDF
No strings attached

CHAPTER 14 : HOMEOSTASIS
HOMEOSTATIC CONTROL
-Homeostasis maintain a constant internal environment in the body
-this involves a receptor, effector and central control

Outline how a negative feedback mechanism works.[4]
When there is a change in factor away from the set-point, it is detected by a receptor
to release hormones. The hormones reach the target organs and carry out corrective
actions to return the factor back to the set-point.
Negative feedback - the body’s mechanism for reversing a change so that it returns back to
the optimum

Positive feedback - any change from the set point is increased (opposite of negative
feedback)

CONTROL OF BODY TEMPERATURE
-Thermoregulation is the control of body temperature which involves nervous and endocrine
systems
HYPOTHALAMUS
-central control for body temperature
-has thermoreceptor cells that monitor the temperature of the blood flowing through it which
is called the core temperature
-receives information about temperature from the receptors on the skin

Decrease in temperature of the surroundings
1)Skin receptors detect a decrease in the temperature of the surroundings
2)Hypothalamus sends impulses that activate physiological responses such as
vasoconstriction, shivering, raising body hairs, decreasing the production of sweat

Increase in temperature of the surroundings
1)Detected by skin receptors or the central thermoreceptors
2)Hypothalamus increases the loss of heat from the body and reduces heat production
(vasodilation, lowering body hairs, increasing sweat production)

, EXCRETION
-the removal of unwanted products of metabolism such as carbon dioxide and urea
UREA -produced in the liver, from excess amino acids
-main nitrogenous excretory product of humans
-it is transported from the liver to the kidneys, in solution in blood plasma
DEAMINATION
-the breakdown of excess amino acids in the liver, by the removal of the amine group which
forms ammonia and urea

AMMONIA
-very soluble and highly toxic compound
-ammonia would rapidly build up in the blood and cause immense damage. This is prevented
by converting ammonia into urea, which is less soluble and toxic

KIDNEY STRUCTURE

1)The whole kidney is covered by a capsule, beneath which lies the cortex
2)The central area is made up of the medulla
3)The area pelvis is where the ureter joins
4)Each kidney receives blood from a renal artery and returns blood via a renal vein
5)Ureter carries urine from the kidney to the bladder

NEPHRON FUNCTION

The benefits of buying summaries with Stuvia:

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

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

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 sunsetstudy. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$7.67. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

73091 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