Top answers

Biology
A Level

State the difference between Apoplastic and symplastic pathways of water movement in plants

•Apoplastic- in cell wall and water moves by cohesion.

•Symplastic- in cytoplasm and water moves by osmosis.

EB
Answered by Ethan B. Biology tutor
7722 Views

Describe the roles of calcium ions and ATP in the contraction of a myofibril (5 marks)

Calcium ions, which diffuse in from the sarcoplasmic reticulum, cause tropomyosin to shift which reveals the myosin binding site located on the actin filament allowing the myosin head to bind. A molecule ...

MY
Answered by Molly Y. Biology tutor
10719 Views

What part do the kidneys play in homeostasis?

The kidneys can be split into 5 main sections. Firstly we have the glomerulus. Blood enters the kidneys via the afferent arteriole and then travels to the glomerulus which is just a cluster of capillaries...

NA
Answered by Nicole A. Biology tutor
3633 Views

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 microsc...

RK
Answered by Rashaad K. Biology tutor
8180 Views

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 L...

UA
Answered by Ursula A. Biology tutor
17212 Views

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