B:5 Homeostasis and Response Paper 2 Flashcards
Write a Definition of Homeostasis?
- Homeostasis is the regulation of conditions inside your body and cells in order to maintain a stable internal environment.
Why Is Homeostasis Important and What does it also include?
- Homeostasis is Really important Because your cells need the right conditions to work properly.
- This Includes having the right conditions for enzymes.
What Does your body use to control for homeostasis and give a example and what are these control systems?
- Your Body uses Control systems for homeostasis
- These control systems are automatic so humans don’t have to think about it.
- For Example:They Keep body temperature,Blood glucose level and water level steady.
Name the 3 Parts of The Control system?
- 1) Receptors.
- 2) Coordination centres.
- 3) Effectors.
What does the control system do if body temperature increase or Decreases?
- The control systems brings it back to normal
What Happens to the control system if the level is too high?
- The control system decrease the level.
What Happens to the control system if the level is too low?
- The control system increases the level.
Write a Definition of Stimulus?
- Stimulus Means a change in the Environment.
When the Level of Something changes What Happens in the Receptor( Step 1 )?
- The Receptors Detects a Stimulus.
- And it sends informations to the Coordination centre.
What Then Happens In the Coordination Centre ( Step 2 )?
- The Coordination Centre received and Processes the Information.
- It Then organises a response.
What Does the Effector Do Then ( Step 3 )?
- The Effectro Then Produces a Response.
- This Returns the level to its optimum Level.
Write a Definition of Optimum?
- Optimum means ideal.
What Does the Nervous System do and name the 5 Parts of the Nervous system?
- The Nervous System detects and Rects Stimuli.
- 1) Central Nervous System (CNS).
- 2) Sensory Neurones.
- 3) Motor Neurones.
- 4) Receptors.
- 5) Effectors.
Write a Definition of Neurones?
- Neurones are Nerve cells.
What Does The Central Nervous System Consist of and What is it connected to?
- The CNS Consist of the brain and Spinal cord.
- The CNS Is connected to the body By Sensory Neurons and Motor Neurones.
What Do Sensory Neurones Do?
- Sensory Neurons Carry information as electrical impulses from the Receptors to CNS.
What Do Motor Neurons Do?
- Motor Neurons Carry electrical Impulses from CNS To Effectors.
What do Receptors do and What do Different Receptors do?
- Receptors are cells that detect stimuli.
- Different receptors detach different stimuli.
What do Effector do Give 2 Example of a Effector And What do the Examples do?
- Effectors respond to electrical impulses and bring about a change.
- For Example: Muscles and Glands are Effectors.
- Muscles Contract and Gland Release Hormones.
Write a Definition of A Gland?
- A Gland is an organ that produces and secretes hormones.
The CNS Is a (________________________________)
- Coordination centre.
Where does CNS receive information from and what carries the response away?
- CNS Receives Information from receptors and the coordinates a response.
- The Response is carried out by effectors.
Write a Definition of Synapse?
- Synapse is a connection between 2 Neurones.
How is Synapse Passed on and What do the chemicals do Next?
- The Electrical Impulses is Passed from 1 Neurons to the next by chemicals.
- These chemicals move across the gap and the chemicals set off a new electrical impulse in the next neurons.
Write a Definition of Reflexes and how quick are they and how do they help?
- Reflexes are automatic responses
- They are Really Quick.
- They can Help stop you getting Injured.
Write a Definition of a Reflex Arc?
- A Reflex arc is the neural pathway that controls an automatic, rapid response to a stimulus.
How do Neurons Get to the Brain?
- The Neurons in the reflex arc go through the spinal cord .
- or through the unconscious part of the brain.
Write a Definition of Relay Neurons?
- Relay Neurons are just Neurons That connect Sensory neurones to motor neurons.
Write a Definition of Unconscious Part of the Brain?
- The uncious part of the brain is the part of the brain that is not involved in thinking.
Write a Definition of Reaction Time and how fast is it and what is it measured in?
- Reaction Time is the time it takes t respond to a Stimulus.
- It’s Often less than a second and its measured in Milliseconds (ms)
Name 3 Factors that Affect Reaction Time?
- 1) Age
- 2) Gender
- 3) Drugs
What Is Caffeine and What Can it do to the Reaction Time?
- Caffeine is a Drug
- It can speed up a Person’s Reaction Time.
In 6 Steps Investigate Reaction Time (PRACTICAL)?
- 1) The Person Begin Tested should sit with their arm resting on the edge of the table.
- 2) hold a ruler between their thumb and forefinger and Make sure the 0 end of the ruler is level with their thumb and finger.
- 3) Then let it go without giving any warning and the person should catch the ruler as quickly as they can.
- 4) Reaction time is Measured by the number on the ruler where it’s caught The Number should be Read from the Top of The Person Thumb.
- 5) Repeat the Test Several Times then Calculate the Mean Distance that the ruler fell.
- 6) Then give the person being tested a caffeinated drink and after 10 minutes repeat step 1 to 6.
The Higher The Number The (_____________________) their Reaction time.
- Slower
Write a Definition of Hormones and Where they are Released?
- Hormones are Chemicals Released By Glands.
- They are Released directly into the Blood.
What are Glands Called and What System do They Make Up?
- These Glands are Cells Endocrine Glands.
- And They make up the Endocrine System.
Write a Definition of Target Organs and Where Is Blood carried ?
- Target Organs are Particular Cells in Particular Organs.
- The Hormones are Carried in the blood to other parts of the body.
Name The 6 Glands In The Endocrine System?
- 1) The Pituitary Gland.
- 2) Thyroid.
- 3) Adrenal Gland.
- 4) Pancreases.
- 5) Ovaries.
- 6) Testes.
What is The Pituitary Gland Sometimes Called?
- The Master Gland
Why is It Called The Master Gland and What Does it Act on Other Hormones?
- Its Called the Master Gland Because It Produces Many Hormones that regulate body conditions.
- These Hormones Act on other glands They Make the glands release hormones that bring about change.