Homeostasis FINAL

Question 1

Describe the role of adrenaline in the ‘fight or flight’ response.

Answer 1

increase aerobic respiration for more energy
also increase heart rate, blood pressure, blood glucose levels ummmm and metobolic rate, etc.

Also, it randomly dilates pupils for better vision

Question 2

Explain the nervous system controls thermoregulation

Answer 2

• Muscles control hair standing on edge and trapping air when cold
• Contraction of muscle causes shivering to increase respiration rate when cold

Question 3

Explain the endocrine system controls thermoregualtion

Answer 3

When cold - Thyroid releases thyroxine to increase metabolic rate and heat

Question 4

Explain how nervous and endocrine control thermoregulation

Answer 4

Sweat - nervous message stimulates sweat glands and glands release sweat to cool down

When cold vasocontrition- The adrenal gland secretes adrenaline for vasocontriction, preventing heat loss as blood is focused towards organs.

When hot its vasodilation- less adrenaline blood flow to skin and cool down.

Question 5

What happens if blood pH is too low

Answer 5

stim- Low blood pH = too much C02
Receptor- chemoreceptor in brain detects blood pH
CNS- Nervous message to the respiratory center
effector: intercostal muscle increase reathing rate
response: increase co2 removed from blood at lungs to increase pH

Question 6

What happens if blood pH is too high

Answer 6

stim- High blood pH = not enough C02
Receptor- chemoreceptor in brain detects blood pH
CNS- Nervous message to the respiratory center
effector: intercostal muscle decreases breathing rate
response: decrease CO2 removed from blood at lungs to decrease pH