CGIER 6

Question 1

define fluid

Answer 1

a substance that conforms to the shape of its container. i.e., liquids
and gases

Question 2

2 types of fluid studies

Answer 2

hydrostatic - study of fluids at rest
hydrodynamic - study of fluids in motino

Question 3

density formula

Answer 3

p=m/v = mass per unit volume = kgm^3

p water = 1k, blood = 1.06k

Question 3

pressure equation

Answer 3

P=F/A = pascals = Pa

Question 4

define pascals principle

Answer 4

Any change in pressure applied
to a completely enclosed fluid
is transmitted undiminished to
all parts of the fluid and the
enclosing walls. P1=P2

Question 5

how to screen for brain tumors

Answer 5

brain tumor = reduction in volume of container contianing CSF fluid resulting in increase in fluid pressure. this can be detected by adding spinal tap between 3rd and 4th lumbar vertebrae

Question 5

describe glaucoma and why it is serious

Answer 5

excess fluid released via meshwork - normal

glaucoma - cannot escape therefore significant increase in intra-ocular pressure( up to 85 mmHg)

this results in permanent damage to optic nerve and blindness if untreated. treatement via laser to make holes

Question 6

what are decubitus ulcers

Answer 6

pressure ulcers caused by spending prolonged periods in same position

forms around bony regions eg. elbow, knee, hips and restricts blood flow to these areas.

Question 7

describe laplace’s law

Answer 7

The larger the vessel radius is, the larger the wall
tension required to withstand a given internal fluid pressure

Question 7

equation for tension in cylinder and sphere

Answer 7

T=Pr/2 in sphere, T=Pr in cylinder

Question 8

from the tension equation,

Question 9

describe the relationship between laplace law and heart

Answer 9

left ventricle = greater volume (than right) therefore more muscle since pressure greater by several times