Lesson 26AS PE Anatomy & Physiology

James BarracloughRespiratory System – Transport of Oxygen

Starter

Using the equipment, build a model of the lungs:

Play doh 2l bottle Scissors Tubing Tape Plastic bag Balloons

Homework

Homework Answers

Topic: Respiratory System

Objectives: by the end of the lesson, learners will be able to: Describe the transport of oxygen & the oxyhaemoglobin dissociation curve Describe gas exchange at the muscles & tissues Define minute ventilation Describe ventilation during exercise

Activity 1

Complete worksheet Part 1

15 minutes & feedback to class

Activity 1 AnswersANSWERS c.97% of O2 carried by red blood cells combined with haemoglobin (iron-based protein)

Haemoglobin + Oxygen = Oxyhaemoglobin Hb O2 HbO2

Each Hb molecule can combine with 4 molecules of O2 = c.1.34ml Concentration of Hb in blood = c. 15g/100ml Therefore 100ml blood can transport up to 20 ml of O2

(1.34 x 15) Remaining 3% of O2 carried in blood plasma Individual pressure exerted by Oxygen in a mixture of gases Decreases Decreases Acidity (see next slide for pH scale) CO2 Temperature Bohr Right Fall in pO2; increase in blood/muscle temperature; increase in pCO2 in muscle; fall in pH

from production of lactic acid Bohr shift; at rest; during exercise; post exercise (see slide 8 for description) http://www.youtube.com/watch?v=Qrvrs6RXxwY

Activity 2

Complete worksheet Part 2

15 minutes & feedback to class

Part 2 Answers Arteries Gradient Capillary Due to high pCO2 in tissues & low pCO2 in arterial

blood CO2 moves in opposite direction Myoglobin Mitochondria Endurance athlete e.g. Mo Farah, Paula Radcliffe Myoglobin Acts as O2 reserve so O2 stored for when needed Arterial- venous oxygen difference (a- VO2 diff.) 25%; 85% https://www.youtube.com/watch?v=J0442YCxpa8

Activity 3

Complete worksheet Part 3

10 minutes & feedback to class

Activity 3 Answers Volume of air inspired OR expired (same

amount) 500ml OR c.7ml/kg of body weight c.350ml Remains in ‘dead space’ i.e. Nose, throat

& trachea Volume of air inspired/expired in 1 minute Tidal volume x frequency of breaths (VE

= TV x f) 12 – 15 breaths per minute 500ml x 15 = 7500ml/min OR 7.5L/min

Activity 4

Complete worksheet Part 4

10 minutes & feedback to class

Activity 4 Answers Endurance Anticipatory rise Release of adrenaline/noradrenaline

stimulating respiratory control centre Steady state Oxygen; carbon dioxide Maximum amount of O2 taken in,

transported & used in 1 minute Lactic acid

Extension Activity AnswersVital capacity =maximum amount

of air a person can expel from lungs after maximum inhalation

Residual volume =  air still remaining in lungs after most forcible expiration possible 

Recap

WWTBAM

Homework: Mind Map +

Mind map

Next Lesson…

Respiratory complications Impact of smoking Adaptive responses to training