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How does the oxygen in the air reach respiring cells in humans?

Air is breathed in through the nose and the mouth. It makes its way down the trachea (windpipe) and enters into the lungs. The air enters into the small sacs of the lungs called alveoli which in a microscope...
RK
Answered by Rashaad K. • Biology tutor
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What is the role of the Loop of Henle in urine production?

The Loop of Henle is a 'U' shaped portion of the nephron tubule which is very important in retaining water and Na+ from urine, in the process of 'Osmoregulation'. Water leaves the descending limb of the Loop...
UA
Answered by Ursula A. • Biology tutor
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Describe how the alveoli are adapted for gas exchange

Alveoli have features that speed up the rate of diffusion so that gases can be exchanged quicly. They have a thin exchange surface - the alevolar epithelium is only one cell thick, which means there's a shor...
KT
Answered by Krish T. • Biology tutor
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Describe the role of haemoglobin in supplying oxygen to the tissues of the body?

Haemoglobin is an oxygen carrying molecule found in red blood cells. Haemoglobin is made up of four polpeptide chains (2 alpha, 2 beta), and consists of four haem groups (iron associated with heam) containin...
OB
Answered by Olivia B. • Biology tutor
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7 Albinism is a genetic trait resulting from the inheritance of recessive alleles. (a) (i) Distinguish between the terms allele and gene. (ii) Explain the meaning of the term recessive allele.

a i) a gene is a section of DNA that codes for a protein and has a specific location on a chromosome while an ellel is just a different form of a gene ii) a recessive allele is one that is expressed in the p...
EI
Answered by Elysa I. • Biology tutor
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