'During stress, adrenalin secreted into the blood stream causes the heartbeat to do this'
go faster
ANATOMY: During stress, adrenalin secreted into the blood stream causes the heartbeat to do this
During stress, adrenalin secreted into the blood stream causes the heartbeat to do this
During stress, adrenalin secreted into the blood stream causes the heartbeat to do this
ANATOMY
go faster
ANATOMY