Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

3. Energy & Cell Processes

Enzymes

Anatomy & Physiology

3. Energy & Cell Processes

Enzymes

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Multiple Choice

An enzyme known as acetylcholinesterase is present in the synaptic cleft. What is its role?

To synthesize acetylcholine from acetate and choline.

To transport acetylcholine across the synaptic cleft.

To break down acetylcholine into acetate and choline.

To inhibit the release of acetylcholine from the presynaptic neuron.

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Verified step by step guidance

Understand the role of acetylcholinesterase: Acetylcholinesterase is an enzyme located in the synaptic cleft, which is the space between neurons at a synapse.

Identify the substrate: Acetylcholine is the neurotransmitter that acetylcholinesterase acts upon. It is released into the synaptic cleft to transmit signals between neurons.

Determine the action of acetylcholinesterase: The enzyme's primary function is to catalyze the breakdown of acetylcholine into acetate and choline, effectively terminating the signal transmission.

Recognize the importance of this process: By breaking down acetylcholine, acetylcholinesterase prevents continuous stimulation of the postsynaptic neuron, allowing the synapse to reset for the next signal.

Consider the consequences of enzyme inhibition: If acetylcholinesterase is inhibited, acetylcholine would accumulate in the synaptic cleft, potentially leading to prolonged stimulation of the postsynaptic neuron and disrupted neural communication.