Essentials of Biology
Essentials of Biology
4th Edition
ISBN: 9780078024221
Author: Sylvia S. Mader Dr., Michael Windelspecht
Publisher: McGraw-Hill Education
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Chapter 5.4, Problem 1LO
Summary Introduction

To determine:

Various ways of moving materials across plasma membrane.

Introduction:

Broadly transport systems can be divided into two types-

1. Passive transport

  • Substances are transported along the concentration gradient.
  • It does not require energy.
  • Substances diffuse through the permeable membrane along the concentration gradient; hence, it is also called as diffusion.

2. Active transport

  • The movement of substances occurs in opposite direction to concentration gradient that is when substances move from lower concentration gradient to higher concentration gradient, energy is required. This is known as active transport.
  • Substances transported with the help of active transport – ionic form – sodium potassium calcium hydrogen chloride and iodide.

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The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license