True/False.  The right side of the heart contracts first & then the left side of the heart contract

Red blood cell production is regulated by the hormone ____that is secreted in the ____

Define autotroph

Identify cell labeled 9 _______ Identify structure 10 _______

The first heart sound (“lub”) is heard when the

Blood type ____ is considered the universal donor; whereas blood type ___ is considered the universal recipient.

The cardio-acceleratory center activates sympathetic neurons and the cardio-inhibitory center controls parasympathetic neurons.

Acetylcholine slows the heart rate by

Identify blood type _______

Identify vessel 19 _______ Identify vessel 20 _______