Question

In the human body, which of the following is considered an external defense in the prevention of disease?

Mucous
Histamines
Antibodies
Fever

Answer 1

I'm thinking A..but also it might be C. @Abhisar

Answer 2

fever http://www.tutorvista.com/content/biology/biology-iv/circulation-animals/internal-defence.php

Answer 3

How antibodies can be external defence system? :O

Answer 4

d

Answer 5

Oh that's right, it's internal..lol.

Answer 6

@wilston123 Please don't give answers, plus that answer is obviously wrong because it IS a disease and we're looking for something that will defend us from a disease.

Answer 7

:O

Answer 8

click the link

Answer 9

Fever is not a disease!!!!!

Answer 10

o.O

Really?

Answer 11

@wilston123 That says 'internal defence'..we're looking for an 'external defence'.

Answer 12

ohhhh

Answer 13

It's a defence sytem, You can call it a physiological defence system which body uses to suppress pathogenic growth inside the body. But of-course it's an internal line of defence system.

Answer 14

sorry

Answer 15

An external defence system will be something which is present on external body features to prevent pathogens from entering the body right from outside.

Answer 16

you were correct the first time
mucous, much as saliva, is something we excrete that helps lyse foreign bodies

Answer 17

the goo that drips out of your nose is a mucous, which helps trap microbes

Answer 18

so when you have a drippy nose, don't be embarrassed :) just let it be

Answer 19

The mucous or mucous membranes line some body cavities that are exposed to the external environment. Ex as nin said, vaginal orifice, rectum, your lips etc...

Answer 20

a very crude overview of the immune system
http://finedrafts.com/files/CUNY/biology/campbellbio9th/CH%2043%20Immune%20System.pdf

Answer 21

@nincompoop I like how you send me a message and I can't reply.