THE HEART

Question 1

EXERCISE INCREASES (…)

Answer 1

HEART RATE

Question 2

WHY DOES HEART RATE INCREASE WHEN EXERCISING

Answer 2

1) MUSLCES NEED MORE ENERGY, SO YOU RESPIRE MORE
2) YOU NEED TO GET MORE OXYGEN INTO THE CELLS AND REMOVE MORE CARBON DIOXIDE
3) EXERCISE INCREASES THE AMOUNT OF CARBON DIOXIDE IN THE BLOOD

Question 3

HOW DOES EXERCISE INCREASE THE AMOUNT OF CARBON DIOXIDE IN THE BLOOD

Answer 3

1) HIGH LEVELS OF BLOOD CO2 ARE DETECTED BY RECEPTORS IN THE AORTA AND CAROTID ARTERY
2) THESE RECEPTORS SEND SIGNALS TO THE BRAIN
3) THE BRAIN SENDS SIGNALS TO THE HEART, CAUSING IT TO CONTRACT MORE FREQUENTLY AND WITH MORE FORCE

Question 4

THE HORMONAL SYSTEM ALSO HELP TO (…)

Answer 4

CONTROL HEART RATE

Question 5

HOW DOES THE HORMONAL SYSTEM HELPS TO CONTROL HEART RATE

Answer 5

1) WHEN AN ORGANISM IS THREATENED (EG. BY PREDATOR) THE ADRENAL GLANDS RELEASE ADRENALINE
2) ADRENALINE BINDS TO SPECIFIC RECEPTORS IN THE HEART CAUSING THE CARDIAC MUSCLE TO CONTRACT MORE FREQUENTLY AND WITH MORE FORCE
3) IT INCREASES OXYGEN SUPPLY TO THE TISSUES GETTING THE BODY READY FOR ACTION