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Flashcards in Human Body Deck (194)
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1

What is the skeleton for

Structural strength

Creates body cavities for organ placement

2

Characteristics of arteries

Thick walls
Carries oxygenated blood
High pressure blood
No valves

3

Characteristics of arterials

Extensions off arteries which can store blood

4

Characteristics of veins

Thin walls
Deoxygenated blood
Valves

5

Characteristics of capillaries

Walls 1 cell thick
Gaseous exchange
Diffusion
Covering alveoli

6

What are muscles for

Attached to the skeleton via tendons allowing movement and posture control

7

Characteristics of red blood cells

Carry oxygen
Contains haemoglobin
No nucleus so more space for haemoglobin

8

What are white blood cells for

To give immunity
(Lymphocytes)

9

What are Platelets for

Clotting (closes wounds)

10

What is homeostasis

Body used feedback and control mechanisms to maintain a stable environment

11

What % of the body is made up of water

65%

12

What does the central nervous system comprise of

Starts at the brain works out to the rest of the body

Involved spinal chord and brain

13

What is the Peripheral nervous system

Senses travel from sense receptors to brain

Consists of nerves and ganglia (clusters of nerves)

14

Normal speed in the motor neurone

0.5m/s

15

Fast speed of the motor neurone

100m/s

16

What state are the sodium / potassium pumps in when at rest

Open

17

What 2 branches does the peripheral nervous system slit into

Somatic nervous system (movement)

Autonomic nervous system (automatic body functions)

18

What does the autonomic nervous system control

Breathing
Homeostasis
Blinking
Reflex
Heart rate
Blood pressure

19

What are the 2 branches of the autonomic nervous system

Sympathetic division (fight or flight )

Parasympathetic (return body to normal state)

20

What must a sense be above the stimulate a response

Sensory threshold

21

What is an absolute threshold

The minimum level of stimulation To trigger a response

22

What will frequent exposure to a stimulation cause

Habituation

23

What is the endocrine system

Chemical messages
Hormones

Slower - multiple cells stimulated at once as a result

24

What is a proprioceptor

Detect and relay precise info about the length of extensions of each muscle

25

What is a mechanoreceptor

Gives precise info about the amount of tension in a muscle

26

Where does the reflex generate its response

The motor nerve in the spinal chord

27

What is a subcutaneous pressure receptor

Found under the skin to orientate you to your surroundings (ie sitting on a chair)

28

Why is partial pressure important for breathing

Partial pressure is required to “force” the oxygen through the alveoli and into the bloodstream

29

At msl what is the total pressure in MMHg

760

30

At msl what is the oxygen partial pressure in mmgh

160