Homeostasis Flashcards Preview

Physiology and Neuroscience > Homeostasis > Flashcards

Flashcards in Homeostasis Deck (29):
1

What are the lobes of the brain?

Frontal lobe
Parietal lobe
Occipital lobe
Temporal lobe

2

What is the Central Nervous System comprised of?

Brain and Spinal cord

3

What is the Peripheral Nervous System comprised of?

Nerve and nerve cells outside the brain and spinal cord

4

What is the neuron responsible for?

Initiating, mediating, modulating most physiological processes in the body

5

What are electrical signals carried in?

Nerve cells

6

What is homeostasis?

Condition of equilibrium (balance) in the body's internal environment due to constant interaction of the body's many regulatory processes

7

What are the normal levels within the body for PO2, PCO2, temperature, blood pressure etc?

PO2- 100mmHg
PCO2- 40mmHg
Blood pressure- 120/80 mmHg
Temperature- 37°C
pH- 7.4
Plasma glucose- 5.5mM

8

Where is intracellular fluid?

Within cells

9

Where is extracellular fluid?

Outside cells

10

Where is ECF in intersitial fluid?

Extracellular fluid between cells of tissues

11

Where is ECF in blood plasma?

Within blood vessels

12

Where is ECF in lymph?

Lymphatic vessels

13

Where is ECF in cerebrospinal fluid?

Around brain and spinal cord

14

Where is ECF in synovial fluid?

In joints

15

Where is ECF in aqueous humour and vitreous body?

In eye

16

What causes disruption in the internal body?

External environment e.g. heat, O2 levels
Internal environment e.g. reduced glucose
Psychological stress

17

What 2 regulating systems bring internal environment back to equilibrium?

Endorcine and Nervous system

18

What is a stimulus?

A disruption that changes a controlled conditions

19

What is a controlled condition?

A monitored variable, e.g. blood pressure, temperatures, blood glucose levels

20

What is a receptor?

Monitors changes in controlled condition and sends input to a control centre

21

What type of pathway goes from the receptor to the brain?

Afferent Pathway

22

What is the control centre?

Evaluates input from receptors then generates output commands when needed

23

What kind of signals are sent out from the Control centre?

Typically nerve impulses, hormones or other chemical signals

24

What type of pathway goes from the Brain to the effectors?

Efferent Pathway

25

What is an effector?

A structure that produces a response or effect that changes the controlled condition. Most organs and tissues in the body can be an effector

26

What is a response?

Alters the controlled condition in some way, either reversing (negative feedback loop) or enhancing (positive feedback loop)

27

When is homeostasis reached?

When controlled condition is back to normal

28

What is a positive feedback loop?

Continually reinforces a change in a controlled condition, some event outside the system must shut it off

29

What is a negative feedback loop?

Slows and then stops when the controlled condition returns to its normal states, regulates conditions in the body that remain stable over time