An athlete's red blood cell (RBC) count and haemoglobin levels can adapt to different environmental conditions to optimise oxygen delivery. The table below shows the average RBC count and haemoglobin concentration of an elite runner at sea level and after a 6-week block of high-altitude training at $m3000\text{ m}$ .

Condition	Average RBC Count ( $cells/dm3\times 10^{12} \text{ cells/dm}^3$ )	Average Haemoglobin Concentration ( $g/dm3\text{g/dm}^3$ )
Sea Level	$4.6$	$140$
After Altitude Training	$5.2$	$161$

Calculate the percentage increase in the athlete's average haemoglobin concentration after altitude training compared to their concentration at sea level.

Explain how this increase in haemoglobin concentration helps to prevent muscle fatigue during prolonged exercise.

Condition	Average RBC Count ( $cells/dm3\times 10^{12} \text{ cells/dm}^3$ )	Average Haemoglobin Concentration ( $g/dm3\text{g/dm}^3$ )
Sea Level	$4.6$	$140$
After Altitude Training	$5.2$	$161$

Calculate the percentage increase in the athlete's average haemoglobin concentration after altitude training compared to their concentration at sea level.

Explain how this increase in haemoglobin concentration helps to prevent muscle fatigue during prolonged exercise.

2.2 Animal tissues, organs and organ systems

Question 15

Markscheme

2.2 Animal tissues, organs and organ systems

Question 15

Markscheme

2.2 Animal tissues, organs and organ systems

Question 15

2.2 Animal tissues, organs and organ systems Questions

2.2 Animal tissues, organs and organ systems

Question 15

2.2 Animal tissues, organs and organ systems Questions