Q: Which of the following equations correctly represents the calculation of surface area to volume ratio for a spherical cell, and why is this ratio important?

$$\text{Surface Area to Volume Ratio} = \frac{4\pi r^2$}{\frac{4}{3}\pi r^3$}$$; it determines the rate of diffusion relative to cell size.

Question 1

Which of the following best describes the function of the plasma membrane in a typical human cell?

Accepted Answer

It acts as a selective barrier, regulating the movement of substances into and out of the cell.

Question 2

A patient is diagnosed with a tumor that is rapidly dividing and invading nearby tissues. Which cellular process has most likely become dysregulated?

Accepted Answer

Cell cycle regulation

Question 3

Which of the following transport mechanisms requires energy in the form of ATP?

Accepted Answer

Active transport

Question 4

A cell is placed in a hypertonic solution. Predict what will happen to the cell and explain why, using the concept of osmosis.

Accepted Answer

The cell will shrink because water moves out of the cell by osmosis.

Question 5

Which of the following is a key difference between epithelial and connective tissues?

Accepted Answer

Epithelial tissues cover surfaces and line cavities, while connective tissues support and bind other tissues.

Question 6

Which specialized epithelial tissue is most likely to be found lining the respiratory tract, and what is its primary function?

Accepted Answer

Pseudostratified ciliated columnar epithelium; movement of mucus

Question 7

During tissue injury, which sequence of events best describes the inflammatory response?

Accepted Answer

Vasodilation, increased permeability, and migration of white blood cells

Question 8

Which of the following best explains why the skin acts as a physical barrier to pathogens?

Accepted Answer

The skin's stratified squamous epithelium and keratinization prevent pathogen entry.

Question 9

A burn patient loses a large portion of the epidermis. Which physiological function of the skin is most immediately compromised?

Accepted Answer

Protection against dehydration and infection

Question 10

Which of the following equations correctly represents the calculation of surface area to volume ratio for a spherical cell, and why is this ratio important?

Accepted Answer

$$	ext{Surface Area to Volume Ratio} = \frac{4\pi r^2$}{\frac{4}{3}\pi r^3$}$$; it determines the rate of diffusion relative to cell size.

Question 11

A patient with a genetic defect in collagen synthesis is likely to have problems with which tissue type, and what is a likely consequence?

Accepted Answer

Connective tissue; weakened structural support

Question 12

Which feedback mechanism is illustrated by the regulation of body temperature, and how does it work?

Accepted Answer

Negative feedback; reverses the initial change to maintain homeostasis

Question 13

Which of the following best describes the process of facilitated diffusion across the cell membrane?

Accepted Answer

Movement of molecules from high to low concentration using carrier proteins without ATP

Question 14

A researcher observes that a tissue sample contains cells with microvilli and tight junctions. Which tissue type is most likely being observed, and what is its primary function?

Accepted Answer

Epithelial tissue; absorption and barrier formation

Question 15

Which of the following chemical reactions is most directly involved in the production of ATP in human cells?

Accepted Answer

Glycolysis of glucose

Question 16

A 70-year-old patient has thin, fragile skin that heals slowly after injury. Which physiological process is most likely impaired due to aging?

Accepted Answer

Decreased cell division and reduced blood supply

Question 17

Which of the following best explains why stratified squamous epithelium is found in areas subject to abrasion, such as the skin and esophagus?

Accepted Answer

It provides multiple layers of cells for protection against mechanical stress.

Question 18

Calculate the osmotic pressure ($$\Pi) $$exerted by a 0.2 M NaCl solution at 37°C ($$T = 310 K$$), using the formula $$\Pi = iMRT$$, where $$i is $$the van 't Hoff factor for NaCl ($$i = 2$$), $$R = 0.0821 L$$·atm/(mol·K).

Accepted Answer

$$\Pi = 2 	imes 0.2 	imes 0.0821 	imes 310 = 10.18$$ atm

Question 19

Which of the following is a function of the hypodermis (subcutaneous layer) of the skin?

Accepted Answer

Insulation and energy storage

Exam 1 Review: Cells, Tissues, and Integumentary System

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