× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
5
a
5
k
5
c
5
B
5
l
5
C
4
s
4
a
4
t
4
i
4
r
4
Home Q & A Board Biology-Related Homework Help General Biology
New Topic  
kellydevenney kellydevenney
wrote...
Go to Answer
Posts: 460
Rep: 0 0
6 years ago
What type of receptor is used for navigation by animals such as sea turtles and homing pigeons?
  1.Chemoreceptors
  2.Electroreceptors
  3.Magnetoreceptors
  4.Nociceptors
 
Question 2

Which of the following types of molecule is secreted by the human brain and acts as a natural pain killer?
  1.catecholamine
  2.endorphin
  3.norepinephrine
  4.serotonin
Read 25 times
2 Replies
Replies
Answer verified by a subject expert
whatever77whatever77
wrote...
#1
Posts: 346
Rep: 0 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

kellydevenney Author
wrote...
#2
6 years ago
Exactly what I needed for my quiz Smiling Face with Open Mouth
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1305 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Related Images
  
 317
  
 394
  
 1084
Your Opinion
Which is the best fuel for late night cramming?
Votes: 145
Previous poll results: What's your favorite math subject?