Tace the impulse, listing the steps in as much detail as possible, from which your brain sends the message to the approprirate muscles to lift a glass of water to drink. As in the previous Application Assignment, detail the steps involved in the transmission of the neural impulse to the muscle fiber and then the steps involved in the sliding filament theory. Then, specify which muscles are pulling on which bones and what type of joints are involved in lifting the glass. (Part two) Finally, trace the path of the water from the mouth to the urethra, listing the path in as much detail as possible.

The least you could do is list the subject of your question

To understand the process of how your brain sends the message to lift a glass of water, it is helpful to break it down into several steps:

1. Initiation of the neural impulse:
- You observe the glass of water and decide to lift it.
- This information is processed in the visual cortex of your brain, where the image is recognized as a glass of water.
- The decision to lift the glass triggers a neural impulse in your brain.

2. Neural transmission to the appropriate muscles:
- The neural impulse travels from the brain through the spinal cord.
- From the spinal cord, the impulse branches out through motor neurons that exit the spine.
- The specific motor neurons that control the muscles involved in lifting (such as those in your arm) are activated.

3. Connectivity with muscle fibers:
- The motor neurons extend to your muscles, reaching the motor end-plates.
- At the motor end-plates, a chemical signal called acetylcholine is released from the neurons into the synapse.
- Acetylcholine binds to receptors on the muscle fibers, which initiates a cascade of events leading to muscle contraction.

4. Sliding filament theory:
- Within your muscle fibers, there are two types of filaments: actin and myosin.
- When the muscle receives the signal to contract, myosin filaments grab onto actin filaments and pull them closer together.
- This process shortens the muscle fibers, resulting in muscle contraction.
- As the muscle contracts, it generates force that can be applied to the bones.

5. Muscles involved and types of joints:
- Lifting a glass of water mainly involves the muscles in your arm, particularly the biceps brachii and the muscles of the forearm.
- The biceps brachii muscle, when contracted, flexes the elbow joint by pulling the radius bone towards the humerus bone.
- In this case, the elbow joint is involved in lifting the glass, acting as a hinge joint that allows movement in one plane.

Moving on to the second part of your question, tracing the path of water from the mouth to the urethra:

1. Mouth:
- The water enters the mouth through ingestion.
- It gets mixed with saliva and undergoes initial breakdown through mechanical and chemical digestion.

2. Pharynx:
- The water is moved from the mouth to the pharynx, a shared pathway for food and air.

3. Esophagus:
- Through muscular contractions known as peristalsis, the water is transported from the pharynx to the esophagus.

4. Stomach:
- The water enters the stomach, where it mixes with gastric juices and continues digestion.

5. Small Intestine:
- The partially digested water passes through the pyloric sphincter into the small intestine.
- In the small intestine, further digestion and absorption of water and nutrients occur.

6. Large Intestine:
- The remaining water, along with indigestible materials, moves into the large intestine (colon) via the ileocecal valve.
- In the colon, water is absorbed, and waste material is formed into feces.

7. Rectum:
- Feces are stored in the rectum until they are ready to be eliminated.

8. canal:
- The feces pass through the canal and are expelled from the body through the anus.

9. Urethra:
- Finally, it is important to note that the urethra is not directly involved in the path of water from the mouth. The urethra is part of the urinary system and is responsible for eliminating urine from the body, not the water consumed orally.