T4

Question 1

define homeostasis

Answer 1

the maintenance of a constant internal environment.

Question 2

why is homeostasis nessasary to humans

Answer 2

maintains temperature and water at steady levels, arerequiredfor cells to function properly.

Question 3

identify how the body regulates temperature

Answer 3

The middle layer of the skin, stores most of thebody’swater.

Question 4

explain how the nervous system works

Answer 4

carries thenerves thatcontrolall your movements neurotransmitter

Question 5

identify two main components of nervous system

Answer 5

spinal cord

brain

Question 6

what are hormones? and what is there purpose?

Answer 6

Hormones are special chemical messengers in the body send feedback to brain
They can influence thefunctionof the immune system, and even alter behavior

Question 7

what is a disease

Answer 7

a disorder of function in a human, animal, or plant

Question 8

identify and compare infectious and non infectious diseases

Answer 8

infection transmitable, caused by pathogen can be spread human to human

non infectious can’t be transmitted caused by nutrition environment genetics

Question 9

response of the human body to infectious and non infectious diseases

Answer 9

infectious, lines of defence-including physical barraies skin - immune response - inflammatry

non infectious correct enzymes, for DNA tumour suppressor genes

Question 10

factors that are characteristics of achieving a healthy body

Answer 10

achole consumption 
smoking status 
low BP- healthy
hight BP - bad 
healthy weight range
physical activity 
good nutrition 
low clostrol

Question 11

identify the many conditions /diseases that make someone unhealthy

Answer 11

anxiety, high BP
flu. high consumptionalcohol
broken bones. no physical activity
genetics

Question 12

explain biotic and abiotic features. provide examples

Answer 12

bioticbioti: all the living things within a ecosystem. eg plants, animals
abiotic: non living components of an ecosystem eg rocks, temp clouds chemicals in soil

Question 13

outline how global systems rely on the on interactions involving biosphere, lithosphere, hydrosphere and atmosphere

Answer 13

hydrosphere: made up of all the water on earth found on surface of earth but also extends down

biosphere all the living organisms on earth

atmosphere the air that surrounds the earth

lithosphere: the ground and the crust that makes up the earth
they all work together ^^^^^^

Question 14

describe how changes in some biotic and abiotic components of an ecosystem effect populations and or communitys

Answer 14

if there is a river in a ecosystem and then there is a drought which is a abiotic factor that drought affects the biotic factors because they have nothing to drink witch also them affect ls the canibals

Question 15

explain hoe carbon is cycled through ecosystems using diagrams

Answer 15

house fire gives of co2
animal reaping and gives of co2 
animals eat plants which gives of co2 
decomposing matter gives of co2 
green plants collect co2

Question 16

nitrogen cycle

Answer 16

Nitrogen is introduced into the soil by precipitation (rain, lightning).

2. Nitrates don’t only come from Nitrogen in the air. They can also be obtained by the conversion of ammonia, commonly used in fertilizers by nitrifying bacteria in the soil. Some root nodules can also convert nitrogen in the soil into nitrates.

3. Plants build up proteins using nitrates absorbed from the soil.

4. When animals like cows, eat these plants, they, in turn, use it to build animal protein.

5-6. When these animals (cows) poop, pee or die, the urea, excreta or carcass are broken down by decomposers and the nitrogen is re-introduced into the soil in the form of ammonia.

7. Nitrates in the soil can also be broken down by denitrifying bacteria

Question 17

analyse interactions between components and procsses within biological systems sutch as the nervious and endocrine system

Answer 17

These chemicals are important for metabolism, growth, water and mineral balance, and the response to stress. Hormones provide feedback to the brain to affect neural processing. Reproductive hormones affect the development of thenervous system.

Question 18

Recall that ecosystems consist of communities of independent organisms and abiotic component of the environment

Answer 18

Ecosystems consist of communities of interdependent organisms and Abiotic component of the environment matter and energy flows through these ecosystems

Question 19

Identify the cycling of matter through ecosystems using diagrams

Answer 19

Food chains are simple models of matter and energy flows in the ecosystem nutrients and energy move from autotroughs eg plants to heterotrophs and eventually to decomposes