Homeostasis, Variation And Evolution Flashcards
What does homeostasis maintain
It maintains optimal conditions for enzyme action and all cell function
What does the nervous system enable
The nervous system enables humans to react to the surroundings and coordinate their behavior
What are reflex actions
Reflex actions are automatic and rapid it they do not involve the conscious part of the brain
What is the endocrine system composed
It’s composed of glands which secrete chemicals
What chemicals are secreted from the gland’s
Hormones 
The endocrine system is composed of glands which secrete chemicals called hormones. Where are the hormones transferred to?
Hormones go directly into the bloodstream and trigger effects in specific target organs
What is the pituitary gland
It’s called the ‘master gland’ and its in the brain
What does the pituitary gland secrete
It secretes several hormones into the blood in response to body conditions
The purity gland secretes several hormones. what do these hormones do?
These hormones act on other glands to simulate other hormones to be released to bring about effects.
Where is blood glucose concentration monitored and controlled by
The pancreas
What is the main male reproductive hormone called
Testosterone
What do enzymes and cells require
A stable condition in order to work
Define homeostasis
The regulation of internal conditions of a cell or organism to maintain optimal conditions for function in response to internal and external changes
Respiration will use glucose to generate what
Energy
In the human body what does homeostasis control (other than the optimum level)
Blood glucose concentration
body temperature
water levels
Homeostasis consist of a automatic control systems making sure for what
that the internal conditions of the body stay consistent as possible
What does the automatic control system involve in the human body
the nervous system or hormones
What are the features of an automatic control system
Receptor cells
Coordination center
Effector
What’s the use of receptor cells
They detect changes in the environment like the body’s internal conditions for example the concentration of glucose in the blood
or
the bodies external conditions for example the temperature of the skin
What do scientists call changes in the environment
A stimulus
Give an example of a coordination center
The brain
The spinal cord
what does the coordination center do
It receives and processes the information from the receptor cells
What is an example of an effector
A muscle
A gland 
What is the job of the effector
It’s receives information from the coordination center and carries out a response which restores optimum levels
Explain the process of an Automatic control system
A stimulus gets sent to the receptor cells
Then to the coordination center then to the effector
Then it’s produces a response and continues
What is the role of the nervous system
It enables humans to react to their surroundings 
Why are reflex actions important
They help protect us from danger and they are rapid
What two parts does the nervous system consists of
The central nervous system (CNS) = Brain and spinal cord
And other nerves running to and from the nervous system
What is the independent variable
Some thing that has changed
What’s the control variable
Something that cannot change
What’s the difference between the nervous system and the endocrine system
The nervous system is faster but shorter
The endocrine system is slower but acts for longer
What’s the use of the pancreas
The pancreas controls the concentration of glucose in the blood
What’s the use of the ovaries (female) and Tasteas (male)
They release hormones and puberty and in reproduction
What’s the use of the thyroid gland
It produces hormones involved in growth and regulating the body’s metabolic rate (Metabolic rate = how rapidly the body’s reaction takes place)
What’s the use of the adrenal glands
Releases hormones in times of fear or stress
Where is the pituitary gland located
In the brain
What does the pituitary gland do
It’s releases different hormones into the blood depending on the conditions and they react on other glands and cause other hormones to be released
Why is glucose needed by every cell
To release energy by respiration
This is why it’s very important to keep the concentration of glucose constant
What does the pancreas produce
Insulin