Histology
Histology is the microanatomy method and a branch of biology that studies the anatomy of tissues. It includes viewing tissue in a magnified view under the microscope. Microanatomy also includes the process of study of organs called organology and the study of cells called cytology. Histopathology is a branch of biology that includes microscopic identification of diseased tissue. The field of histology comprises the preparation of the tissues and collection of cells as specimens for examination under the microscope. These processes are done by technicians like histologists, histotechnicians, and biomedical scientists. Histopathology is the diagnosis and research of tissue diseases that require the examination of tissues and/or cells under a microscope. Histopathologists are in charge of determining tissue diagnosis and assisting clinicians in managing a patient's care.
Endocrine System
Human body functions due to the collective work of the organ systems. One of them is the endocrine system. It is a chemical messenger system constituting the hormones directly released by the endocrine glands into the circulatory system. The study of this system is known as endocrinology. The word 'endon' means inside, and 'crine' means secrete, making the word "endocrine."
![**Question:**
Identify the structure of the muscle fiber as indicated by the arrow in the image.
**Image Description:**
The image shows a detailed model of a muscle fiber. The model is sectioned to display various structures, and an arrow points to a specific area highlighted in blue. Surrounding the arrow, branching structures are visible that resemble the contacting junctions between nerve fibers and muscle tissue.
**Options:**
- Synaptic cleft
- Motor end plate
- Myelin sheath
- Axon terminal
**Explanation:**
The arrow is pointing to a section of the muscle fiber model likely representing the neuromuscular junction area. This area involves the interaction between nerve endings and muscle fibers, crucial for muscle contraction. The options provided relate to parts of this junction:
- **Synaptic cleft**: The space between the nerve ending and the muscle fiber.
- **Motor end plate**: The specialized region of the muscle fiber membrane at the junction.
- **Myelin sheath**: An insulating layer surrounding nerve fibers, not directly part of the muscle fiber.
- **Axon terminal**: The end part of a nerve cell that releases neurotransmitters to communicate with the muscle fiber.
Based on the typical anatomy of a neuromuscular junction, the highlighted structure could reasonably be the motor end plate or the axon terminal, given these are direct interaction points in muscle fiber models.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F829f5b63-d840-4692-95ad-48370fec1ffe%2F907e5dab-f6b4-427b-a664-815e7f0eb0b6%2Fx9jsc5_processed.png&w=3840&q=75)
![**Question:** Identify the structure of the muscle fiber as indicated by the arrow in the image.
**Image Description:** The image shows a model of a muscle fiber. A black arrow points to a specific structure within the model. The model uses several colors to represent different sections:
- Gray lines are parallel and extend horizontally across the top of the image.
- A prominent yellow network covers the model, resembling the sarcoplasmic reticulum.
- Red sections are interspersed, likely representing mitochondria or other cellular components.
**Options:**
- ○ I band
- ○ A band
- ○ Z disc
- ○ H zone
**Explanation:**
- **I Band:** The light band composed of actin filaments only.
- **A Band:** The dark band where actin and myosin filaments overlap.
- **Z Disc:** The boundary structure of the sarcomere, where actin filaments are anchored.
- **H Zone:** The central part of the A band where only myosin is present, visible during muscle relaxation.
Select the correct option based on the indicated structure in the model.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F829f5b63-d840-4692-95ad-48370fec1ffe%2F907e5dab-f6b4-427b-a664-815e7f0eb0b6%2Fcc12j24_processed.png&w=3840&q=75)
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