Search found 10 matches

by bryanwong
Sun Apr 29, 2012 10:01 am
Forum: General Discussion
Topic: how to know a muscle is contracting or relaxing
Replies: 2
Views: 6973

how to know a muscle is contracting or relaxing

[size=150]how to know a muscle is contracting or relaxing?

Some sources say that we have to determine its thickness while some say we have to determine the degree the
muscle form with the bone.

which is true?
thx for your kind help.
by bryanwong
Mon Mar 26, 2012 12:46 pm
Forum: Human Biology
Topic: Reflex actions VS. Involuntary actions
Replies: 0
Views: 2745

Reflex actions VS. Involuntary actions

what are the differences between reflex action and involuntary action?

THX for your answers

Plz give resources if there are any

I have been learning coordination recently
by bryanwong
Mon Jan 09, 2012 7:14 am
Forum: General Discussion
Topic: carbon dioxide and haemoglobin
Replies: 5
Views: 3636

Wikipedia says that carbaminohemoglobin is formed
but my textbook says that carboxyhemoglobin is formed
they are both referring to the transport of carbon dioxide
(the way that CO2 combines with haemoglobin)
by bryanwong
Sat Jan 07, 2012 9:48 am
Forum: General Discussion
Topic: carbon dioxide and haemoglobin
Replies: 5
Views: 3636

carbon dioxide and haemoglobin

which is formed when carbon dioxide combines with haemoglobin(some carbon dioxide is carried by haemoglobin)?

my textbook says that,
carboxyhemoglobin is formed ,but i found that carbaminohemoglobin is formed instead on the internet .
which one is correct?

thanks for your answers :D [/size]
by bryanwong
Mon Dec 26, 2011 10:12 am
Forum: General Discussion
Topic: why veins have a thicker layer of fibrous tissue ?
Replies: 0
Views: 1446

why veins have a thicker layer of fibrous tissue ?

why veins have a thicker layer of fibrous tissue than arteries?
Thanks for your help!
by bryanwong
Fri Dec 23, 2011 9:17 am
Forum: Human Biology
Topic: chamber?! left or right?
Replies: 1
Views: 1579

chamber?! left or right?

how to determine the left and right chamber of human heart by observation?
thanks for your answers :D
by bryanwong
Fri Dec 23, 2011 7:26 am
Forum: Human Biology
Topic: pressure and velocity in blood vessels
Replies: 2
Views: 5802

Re: pressure and velocity in blood vessels

p.s. The rate of blood flow decreases when pressure drops
so why the pressure drops while the velocity increases when the blood reaches the venules and the veins ?
by bryanwong
Fri Dec 23, 2011 6:39 am
Forum: Human Biology
Topic: pressure and velocity in blood vessels
Replies: 2
Views: 5802

pressure and velocity in blood vessels

in the textbook, it says, "the blood pressure is even lower when it reaches the venules and the vein due to the friction of the capillary wall." However,later it says "The velocity of blood rises slowly again later since the cross sectional area of veins is smaller than capillaries.&q...
by bryanwong
Tue Nov 29, 2011 12:53 pm
Forum: Human Biology
Topic: why larger organisms like humans need a breathing system
Replies: 3
Views: 1843

YES,by diffsuin across their body cells
by bryanwong
Mon Nov 28, 2011 1:57 pm
Forum: Human Biology
Topic: why larger organisms like humans need a breathing system
Replies: 3
Views: 1843

why larger organisms like humans need a breathing system

why larger organisms like humans need a breathing system while small organisms don't ?
thanks for you answers