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 _______

Match the interaction with the expected outcome.

Cell that exist in the body for years and enable a quick response to subsequent meetings with the same antigen

Blood is classified as ____________ tissue

Identify structure 7 _______ Identify structure 8 _______