× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
L
3
d
3
y
3
a
3
n
3
d
3
e
3
d
3
c
3
p
3
M
3
a
3
Home Q & A Board Biology-Related Homework Help General Biology
New Topic  
Groanier Groanier
wrote...
Go to Answer
Posts: 498
Rep: 0 0
6 years ago
The primary pacemaker of the heart is the
 
 a. bicuspid valve.
  b. tricuspid valve.
  c. aorta.
  d. sinoatrial node.

Question 2

Blood vessels that return blood from capillaries back to the heart are
 
 a. arteries.
  b. veins.
  c. portal veins.
  d. arterioles.
Read 57 times
3 Replies
Replies
Answer verified by a subject expert
DunkinJrDunkinJr
wrote...
#1
Top Poster
Posts: 548
Rep: 0 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

Groanier Author
wrote...
#2
6 years ago
All are answered correctly
wrote...
#3
6 years ago
Happy to help
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1133 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 319
  
 186
  
 371
Your Opinion
What's your favorite funny biology word?
Votes: 336
Previous poll results: Where do you get your textbooks?