A. Cells have characteristic structures and functions that make them distinctive.
B. Processes in a cell can be classified broadly as growth, maintenance, reproduction, and homeostasis.
C. Life can be organized in a functional and structural hierarchy ranging from cells to the biosphere.
D. Most multicellular organisms are composed of organ systems whose structures reflect their particular function.
Related Courses
Related Access Points
Related Resources
Lesson Plans
Text Resource
Tutorials
Virtual Manipulative
Student Resources
Tutorials
The transmission of a nerve impulse along a neuron from one end to the other occurs as a result of electrical changes across the membrane of the neuron. This tutorial will help students to visualize and understand the transmission of a nerve impulse.
Type: Tutorial
This tutorial explains how a charge is generated across a membrane. The function and role of the voltage-gated sodium ion channel and voltage-gated potassium ion channel are explained in detail.
Type: Tutorial
This tutorial explains that the source of the impulse in a neuron is a rapid change in the polarity of the cell membrane in a restricted area. The direction of the electrical gradient is rapidly reversed and then returns to normal. The change in charge stimulates the process to happen in adjacent parts of the cell and the change in the polarity travels down the neuron.
Type: Tutorial
Virtual Manipulative
In this simulation, you will explore how neurons conduct electrical impulses by using the action potential. This phenomenon is generated through the flow of positively charged ions across the neuronal membrane. Stimulate a neuron and monitor what happens. You can pause, rewind, and move forward in time in order to observe the ions as they move across the neuron membrane.
Other ways to explore:
- Describe why ions can or cannot move across neuron membranes.
- Identify leakage and gated channels, and describe the function of each.
- Describe how membrane permeability changes in terms of different types of channels in a neuron.
- Describe the sequence of events that generates an action potential.
Type: Virtual Manipulative
Parent Resources
Virtual Manipulative
In this simulation, you will explore how neurons conduct electrical impulses by using the action potential. This phenomenon is generated through the flow of positively charged ions across the neuronal membrane. Stimulate a neuron and monitor what happens. You can pause, rewind, and move forward in time in order to observe the ions as they move across the neuron membrane.
Other ways to explore:
- Describe why ions can or cannot move across neuron membranes.
- Identify leakage and gated channels, and describe the function of each.
- Describe how membrane permeability changes in terms of different types of channels in a neuron.
- Describe the sequence of events that generates an action potential.
Type: Virtual Manipulative