Multiple Choice
Scientists believe that the heart of the common (chordate) ancestor of all vertebrates
A) was little more than a heavily-muscled region of the ventral artery.
B) had two chambers.
C) had three chambers.
D) had four chambers.
E) consisted of a single ventricle.
Correct Answer:
Verified
Correct Answer:
Verified
Q26: Exchange of gases and metabolites between the
Q27: Stimulating the vagus nerve would cause<br>A)blood pressure
Q28: Jim is suffering from congestive heart failure,in
Q29: What type of mollusk has a closed
Q30: Refer to the diagram below of the
Q32: What is true about about mammalian red
Q33: Animals with closed circulatory systems are more
Q34: The cells that normally lack a nucleus
Q35: Elephantiasis is an infectious disease in which
Q36: When you are upright,what is the primary