Paper 1 Mock HTI

Question 1

What type of proteins are channel proteins

Answer 1

Intrinsic

Question 2

Why doers lymph contain more protein than tissue fluid

Answer 2

Because of antibody production

Question 3

How are plants able to survive in a sealed glass container

Answer 3

• light energy is the only requirement from outside terrarium
• respiration provides CO2 and water for photosynthesis
• ATP still produced/ energy provided for cell activities

Question 4

Why can plants in deep water survive where other plants cannot

Answer 4

They have pigments that absorb shorter wavelengths of light
- these wavelengths can penetrate water to greater depths

Question 5

What are some banned substances (performance enhancing drugs)

Answer 5

Anabolic steroids
Narcotic drugs
Stimulants

Question 6

How is furosemide able to act as a masking agent to banned substances

Answer 6

Increase removal of drugs

Question 7

Describe the homeostatic mechanisms that regulate water content of blood

Answer 7

Mechanism of ADH
- ADH targets cells of collecting ducts
- release of second messenger
- vesicles with aquaporins fuse with plasma membrane
- increase in permeability of collecting ducts wall
- more water moves into cells

Role of receptors
Sensory receptors
Located in hypothalamus
- osmoreceptors
- detect changes in osmotic pressure
- respond to effects of osmosis by shrinking or swelling

Posterior pituitary
ADH made in hypothalamus
- moves down axon to posterior pituitary
Stored in vesicles
Action potentials in neurosecretory cells
ADH released by posterior pituitary
By exocytosis