11. Nervous Tissue

Action Potentials

The Absolute and Relative Refractory Periods

 The CNS can discriminate between strong and weak stimuli as strong stimuli increase the frequency of action potentials. 

 increase the amplitude of action potentials 

 increase the frequency of action potentials 

 The CNS can discriminate between strong and weak stimuli as strong stimuli __________. 

The Action Potential

Neural Conduction, Action Potential, and Synaptic Transmission

Myelination and Saltatory Conduction

The Nervous System

Na+ channels are inactivating and K+ channels open during repolarization. The lack of positive charges (sodium) entering the cell and the movement of positive charges (potassium) out of the cell reestablish the negativity on the inside of the membrane.

Which part of the action potential occurs when the voltage-gated Na+ channels are inactivating and voltage-gated K+ channels open?

 Only action potentials use voltage-gated channels that rely on a threshold. 

 Which of the following electrical events occurs when a certain threshold is reached? 

Graded Potentials and Action Potentials

During repolarization, voltage-gated K+ ion channels are open and voltage-gated Na+ channels are closed.

During which phase of an action potential are voltage-gated K+ channels open, while voltage-gated Na+ channels are closed?

 Positive feedback is absent in graded potentials. 

 Graded potentials occur in the dendrites and cell bodies of neurons. 

 Graded potentials travel short distances. 

 Which of the following is characteristic of an action potential? 

 An action potential is an all-or-none phenomenon: it either happens completely or doesn't happen at all. 

 An action potential is a phenomenon that either happens completely or doesn't happen at all. 

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AK LECTURES

1. Introduction to A&P

2. Chemistry

3. Cells

4. Tissues

5. Integumentary System

6. Bones + Skeletal Tissues

7. Skeletal System

8. Joints

9. Muscles and Muscle Tissue

10. Muscular System

12. Central Nervous System

13. Peripheral Nervous System

14. Autonomic Nervous System

15. Special Senses

16. Endocrine System

17. Blood

18. Cardiovascular System: the Heart

19. Cardiovascular System: Blood Vessels

20. Lymphatic System

21. Immune System

22. Respiratory System

23. Digestive System

24. Nutrition, Metabolism, Energy Balance

25. Urinary System

26. Fluid and Electrolyte Balance, Acid Base Balance

27. Reproductive System

28. Pregnancy and Human Development

29. Heredity

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Myelin Sheath

Nervous System Cells

Nervous System

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Basic Principles of Electricity

Resting Membrane Potential

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Electrical and Chemical Synapses

Excitatory and Inhibitory Postsynaptic Potentials

Synapse

Neurotransmitters and Receptors

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