Question

lab 6
critical thinking & review questions
2 match the tissue type to its basic description
c simple squamous epithelium
a simple cuboidal epithelium
b stratified squamous epithelium
e areolar connective tissue
d cardiac muscle
3 match the tissue type to an example of its location.
c simple columnar epithelium
d adipose tissue
a dense fibrous connective tissue
b hyaline cartilage

1. speculate as to why the tissue level of organization is necessary (why can’t one big cell take

the place of a tissue?). note there is more than one right way to answer this question.

Explanation:

A single large cell cannot replace tissue for key reasons:

1. Surface Area to Volume Limitation: As cell size increases, its volume grows faster than its surface area ($\text{Surface Area} \propto r^2$, $\text{Volume} \propto r^3$). This limits the rate of nutrient/waste exchange across the cell membrane, making it impossible for a giant cell to support its own metabolic needs.
2. Functional Specialization: Tissues consist of specialized cells adapted for specific tasks (e.g., contraction, secretion, protection). A single cell cannot simultaneously perform all the diverse functions of a tissue or organ system.
3. Structural Integrity: Tissues (and extracellular matrix in connective tissues) provide mechanical strength, support, and organization that a single large cell cannot offer, especially for load-bearing or protective roles.
4. Damage Resilience: A tissue with many cells can survive damage to individual cells, while a single giant cell would fail entirely if injured.

Answer:

The tissue level of organization is necessary because:

1. A single large cell would face fatal surface area-to-volume ratio limitations, unable to exchange nutrients/waste fast enough to support its metabolism.
2. Tissues allow for cellular specialization, enabling distinct, targeted functions (e.g., muscle contraction, epithelial protection) that one cell cannot perform simultaneously.
3. Tissues (with extracellular matrix in many cases) provide structural strength, support, and resilience that a single cell cannot match, critical for bodily structure and injury resistance.