1. what drives the blood supply to the parts of the body?
2. what are the 3 main parts the blood is made of? fill in the diagram below. percentages of the volume of this sample of blood?
about 55%
about 1%
about 44%
9. why is the shape of the red blood cells helpful?
10. what is the function (job) of the red blood cells?
11. what is the function (job) of white blood cells?
12. what is the function (job) of platelets?
13. how do platelets form a blood clot?
14-16. label the microscopic image to show which part is red blood cells, plasma, and white blood cells.

Question

Accepted Answer

### Question 9:
# Brief Explanations:
Red blood cells are biconcave discs. This shape increases their surface area, which is helpful for efficient gas (oxygen and carbon dioxide) exchange. It also allows them to be flexible, so they can pass through narrow capillaries easily.
# Answer:
The biconcave disc shape of red blood cells increases surface area for gas exchange and allows flexibility to pass through narrow capillaries.

### Question 10:
# Brief Explanations:
Red blood cells contain hemoglobin, a protein that binds to oxygen. Their main function is to transport oxygen from the lungs to the body's tissues and to transport carbon dioxide from the tissues back to the lungs to be exhaled.
# Answer:
The function of red blood cells is to transport oxygen from the lungs to body tissues and carbon dioxide from tissues to the lungs.

### Question 11:
# Brief Explanations:
White blood cells (leukocytes) are part of the immune system. Their job is to defend the body against infections, diseases, and foreign invaders (like bacteria, viruses, and parasites). They can identify and destroy pathogens or produce antibodies to neutralize them.
# Answer:
The function of white blood cells is to defend the body against infections, diseases, and foreign invaders.

### Question 12:
# Brief Explanations:
Platelets (thrombocytes) are involved in blood clotting (hemostasis). When a blood vessel is damaged, platelets stick to the site of injury, clump together, and help form a blood clot to stop bleeding and prevent excessive blood loss.
# Answer:
The function of platelets is to help form blood clots to stop bleeding when a blood vessel is damaged.

### Question 13:
# Brief Explanations:
When a blood vessel is injured, platelets are activated. They adhere to the damaged blood vessel wall (to the exposed collagen fibers). Then, they change shape and release chemicals that attract more platelets, causing them to clump (aggregate) together. This aggregation, along with the formation of a fibrin mesh (from the coagulation cascade), forms a blood clot that seals the wound.
# Answer:
When a blood vessel is damaged, platelets adhere to the injury site, change shape, release chemicals to attract more platelets, aggregate, and along with fibrin, form a clot to seal the wound.

### Questions 14 - 16 (Labeling the microscopic image):
(Note: Since the microscopic image is not fully visible, but generally, in a blood smear under a microscope: )
# Brief Explanations:
- **Plasma**: The liquid, straw - colored part of the blood, in which blood cells are suspended. It appears as the clear (or slightly stained) background between the cells.
- **Red Blood Cells (RBCs)**: These are the most numerous cells, appearing as small, biconcave, red - stained (in a typical Wright's stain) discs, often packed closely together.
- **White Blood Cells (WBCs)**: These are larger than RBCs, have a nucleus, and are less numerous. They may have different shapes depending on the type (e.g., lymphocytes have a round nucleus, neutrophils have a multi - lobed nucleus), and they are often more lightly stained or have a different color intensity compared to RBCs.
To label: Identify the area with the liquid background as plasma, the numerous small disc - shaped cells as red blood cells, and the larger cells with nuclei as white blood cells.
# Answer:
- Plasma: The liquid background between blood cells.
- Red Blood Cells: The numerous small, biconcave - looking (or disc - shaped) cells.
- White Blood Cells: The larger cells with visible nuclei (less numerous than RBCs).

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QUESTION IMAGE

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Explanation:

Question 9:

Answer:

Question 10: