Question

tissue structure and function: general review

1. define tissue:
2. use the key choices to identify the major tissue types described below.

key: connective epithelium muscular nervous

1. lines body cavities and covers the bodys external surface
2. pumps blood, flushes urine out of the body, allows one to swing a bat
3. transmits waves of excitation
4. anchors and packages body organs
5. cells may absorb, protect, or form a filtering membrane
6. most involved in regulating body functions quickly
7. major function is to contract
8. the most durable tissue type
9. abundant nonliving extracellular matrix
10. forms nerves

epithelial tissue

1. on what bases are epithelial tissues classified?
2. how is the function of an epithelium reflected in its arrangement?
3. where is ciliated epithelium found?

what role does it play?

Explanation:

1. A tissue is a group of cells that are similar in structure and function and work together to perform a specific task.

2.

• 1. Epithelium: It lines body cavities and covers the body's external surface.
• 2. Muscular: Muscles pump blood (cardiac muscle), flush urine (smooth muscle in urinary tract), and allow movement like swinging a bat (skeletal muscle).
• 3. Nervous: Nervous tissue transmits waves of excitation (nerve impulses).
• 4. Connective: Connective tissue anchors and packages body organs (e.g., adipose tissue, tendons).
• 5. Epithelium: Epithelial cells can absorb (e.g., in the intestine), protect (e.g., skin epithelium), or form a filtering membrane (e.g., in the kidney).
• 6. Nervous: Nervous tissue is most involved in quickly regulating body functions (through nerve impulses).
• 7. Muscular: The major function of muscular tissue is to contract.
• 8. Connective: Connective tissue (e.g., bone) is often the most durable tissue type.
• 9. Connective: Connective tissue has an abundant non - living extracellular matrix.
• 10. Nervous: Nervous tissue forms nerves.

1. Epithelial tissues are classified based on the number of cell layers (simple - one layer, stratified - multiple layers) and the shape of the cells (squamous - flat, cuboidal - cube - shaped, columnar - column - shaped).
2. The function of an epithelium is reflected in its arrangement. For example, simple squamous epithelium (thin, flat cells) is good for diffusion (e.g., in the alveoli of the lungs). Stratified squamous epithelium (multiple layers of cells) is good for protection (e.g., in the skin). Simple columnar epithelium (tall, column - shaped cells) can be involved in absorption (e.g., in the small intestine, where microvilli on the apical surface increase the surface area for absorption).
3. Ciliated epithelium is found in the respiratory tract (trachea, bronchi) and the fallopian tubes. In the respiratory tract, the cilia move mucus (with trapped dust, pathogens etc.) upwards to the pharynx for swallowing or expulsion. In the fallopian tubes, cilia help move the ovum (egg) towards the uterus.

Answer:

1. A group of similar cells working together for a specific function.

2.

• 1. Epithelium
• 2. Muscular
• 3. Nervous
• 4. Connective
• 5. Epithelium
• 6. Nervous
• 7. Muscular
• 8. Connective
• 9. Connective
• 10. Nervous

1. Based on the number of cell layers (simple/stratified) and cell shape (squamous/cuboidal/columnar).
2. Function - arrangement correlation: simple squamous (diffusion), stratified squamous (protection), simple columnar (absorption - related arrangement like microvilli).
3. Found in respiratory tract (trachea, bronchi) and fallopian tubes. Role: In respiratory tract - move mucus; in fallopian tubes - move ovum.