MYTUTOR SUBJECT ANSWERS

1683 views

Describe the passive movement through diffusion and explain Fick's Law

Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration. It continues until the concentration of substances is uniform throughout. Since the movement is always down the concentration gradient, it requires no energy. 

One major example of diffusion is gas exchange for respiration — this is the process used in oxygen entering a cell, and carbon dioxide leaving. The blood system in humans continually brings more oxygen to the cell and takes carbon dioxide away, maintaining a high concentration gradient.

Fick's law is used to measure the rate of diffusion. It states that the rate of diffusion across an exchange surfaces (e.g. membrane, epithelium) is = (surface area x difference in concentration gradient) / thickness of surface. The larger the area and difference in concentration is and the thinner the surface is, the quicker rate the diffusion has. Moreover, temperature increases rate of diffusion due to increasing kinetic energy.

An example of animal's body part that increases the rate of diffusion is microvilli. They are extensions of plasma membrane that increase the surface area of the membrane and thus increase the diffusion rate.

Zuzana B. 13 plus  English tutor, GCSE English tutor, 11 Plus English...

12 months ago

Answered by Zuzana, an A Level Biology tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

208 SUBJECT SPECIALISTS

£24 /hr

Sanskrithi S.

Degree: Medicine (Other) - Oxford, University College University

Subjects offered:Biology, Maths+ 6 more

Biology
Maths
Chemistry
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Oxbridge Preparation-
-Medical School Preparation-

“I am a third year medical student at the University of Oxford whose aim is to support and guide students in their science studies.”

MyTutor guarantee

|  4 completed tutorials

£30 /hr

Laura A.

Degree: Medicine (Other) - Leeds University

Subjects offered:Biology, English Literature+ 4 more

Biology
English Literature
.UKCAT.
-Personal Statements-
-Medical School Preparation-

“I am a medical student with a degree in Clinical Sciences. I am an enthusiastic teacher with experience helping students maximise their potential.”

Trusted by schools

|  21 completed tutorials

£24 /hr

Neha C.

Degree: Medicine (Bachelors) - Birmingham University

Subjects offered:Biology, Maths

Biology
Maths

“Passionate, patient and pleasant tutor, tutoring students on maths and science subjects.”

About the author

Zuzana B.

Currently unavailable: for regular students

Degree: Biomedical Sciences with Management (Medical Biology) (Bachelors) - Edinburgh University

Subjects offered:Biology, Science+ 3 more

Biology
Science
Maths
Human Biology
-Personal Statements-

“About me: I have always found science very interesting and later realizing that understanding of it may have a significant impact on my life made me want to dig into scientific field more. Once you understand the principles, it can he...”

MyTutor guarantee

You may also like...

Posts by Zuzana

Describe the passive movement through diffusion and explain Fick's Law

Find x and y of these two equations: 2x - 3y = 13 and 3x + y = 3

What are the major parts of a neuron? What are the three types of nerve cells?

Other A Level Biology questions

what is the structure of a skeletal muscle?

What are the features of alveolar epithelium which allow efficient gas exchange?

Describe the effects of cigarette smoke on the airway.

How do plant stomata open and close?

View A Level Biology tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok