Biology Chapter 8.4: Homeostasis and Cells
32 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What are the three main ways cells signal to each other in large organisms?

  • Gap junctions, exocytosis, and hormone release
  • Direct toxicity, hormone receptors, and gap junctions
  • Exocytosis, gap junctions, and local signaling (correct)
  • Exocytosis, osmosis, and direct stimulus

    • Which of the following is not a function of cellular signals in multicellular organisms?

  • Causing the cell to change its activities
  • Speeding up cell production
  • Fusing cells together (correct)
  • Slowing down cell production

    • What is one key function of hormones in cellular communication?

  • Carrying signals from one part of the body to another (correct)
  • Transporting visual information between cells
  • Supplying energy directly to cells
  • Providing rapid information transfer

    • What is the consequence of the body not having enough energy produced by mitochondria?

    <p>The system may fail to function and even die</p> Signup and view all the answers

    How do gap junctions contribute to cellular communication?

    <p>By allowing direct passage of signals between adjacent cells</p> Signup and view all the answers

    What role do exocytosis processes play in cellular communication?

    <p>They release signal molecules that bind to receptors on other cells</p> Signup and view all the answers

    What is a major symptom caused by LCHRs (Leigh-like congenital lactic acidosis hereditary recessive disorders)?

    <p>Deficiency of mitochondria</p> Signup and view all the answers

    How do hormones differ from other signal molecules in terms of cellular communication?

    <p>They typically signal over longer distances and take more time</p> Signup and view all the answers

    What is a key characteristic of cells in multicellular organisms?

    <p>They are specialized and interdependent.</p> Signup and view all the answers

    How do cells specialize within a multicellular organism?

    <p>By turning specific genes on or off.</p> Signup and view all the answers

    What role do red blood cells play in the body?

    <p>They carry oxygen to and from the body.</p> Signup and view all the answers

    Where are chloroplasts typically found in a plant?

    <p>In the leaves of the plant.</p> Signup and view all the answers

    What is the function of white blood cells?

    <p>To assist in healing and protecting tissues.</p> Signup and view all the answers

    What unique feature do cells in the upper epidermis of some plants have?

    <p>They make water-borne flowers.</p> Signup and view all the answers

    What is NOT a function of specialized cells in plants?

    <p>Energy storage in roots.</p> Signup and view all the answers

    What determines the unique function of a specialized cell?

    <p>The arrangement of the cells in a multicellular organism.</p> Signup and view all the answers

    Which organ has the highest percentage of cell volume attributed to mitochondria?

    <p>Heart, left ventricle</p> Signup and view all the answers

    How does the organization of cells into tissues, organs, and organ systems benefit a multicellular organism?

    <p>It allows the organism to maintain homeostasis</p> Signup and view all the answers

    Why are tissues reliant on ATP production adversely affected by defective mitochondria?

    <p>Mitochondria are responsible for energy production</p> Signup and view all the answers

    Which level of organization is directly responsible for performing a specific function within multicellular organisms?

    <p>Tissues</p> Signup and view all the answers

    How would you graph the distribution of mitochondria in various organs?

    <p>Using bar chart for comparative volume percentage</p> Signup and view all the answers

    Which statement best describes the role of tissues in multicellular organisms?

    <p>Tissues are groups of similar cells performing a particular function</p> Signup and view all the answers

    What is a potential consequence of having defective mitochondria in heart tissue?

    <p>Decreased ATP production</p> Signup and view all the answers

    What constitutes an organ system in the provided example?

    <p>Brain, spinal cord, and nerves</p> Signup and view all the answers

    How do single-celled organisms maintain homeostasis?

    <p>By growing, metabolizing, reacting to environmental changes, and reproducing</p> Signup and view all the answers

    Which of the following is not a way multicellular cells work together to maintain homeostasis?

    <p>Individually searching for energy sources</p> Signup and view all the answers

    What is essential for unicellular organisms to successfully maintain homeostasis?

    <p>Rapid reproduction</p> Signup and view all the answers

    What role do stem cells play in multicellular organisms?

    <p>They are used to make blood for other organisms</p> Signup and view all the answers

    Why are cells considered the most numerous type of life on Earth?

    <p>They can both be single-celled and part of multicellular organisms</p> Signup and view all the answers

    Which statement accurately describes autotrophic unicellular organisms?

    <p>They transport water to move salts and need energy to maintain their membrane</p> Signup and view all the answers

    What describes the primary difference between unicellular and multicellular organisms in the context of homeostasis?

    <p>Unicellular organisms handle all homeostasis functions within one cell</p> Signup and view all the answers

    Which process among the following is not directly involved in unicellular homeostasis?

    <p>Cellular coordination</p> Signup and view all the answers

    Study Notes

    Homeostasis and Cells

    The Cell as an Organism

    • Cells are the basic living unit of all organisms, and sometimes a single cell is the organism.
    • Single-celled organisms grow, metabolize, respond to environmental changes, and reproduce to maintain homeostasis.

    Autotrophic Organisms

    • A unicellular cell needs to find a source of energy to maintain its cell membrane and form.
    • Cell division is essential to maintain homeostasis.

    Multicellular Life

    • In multicellular organisms, cells work together to achieve a common goal, like members of a football team.
    • Cells in multicellular organisms are specialized, each with a particular function such as muscle, nerve, or skin cells.

    Cell Specialization

    • Specialized cells have different roles due to the arrangement of genes within them.
    • Red blood cells carry oxygen and have enough iron to do so.
    • White blood cells help heal tissue damage.

    Specialized Plant Cells

    • Plant cells contain chloroplasts, the organelles where photosynthesis occurs.
    • Cells in leaves have numerous chloroplasts, while cells in roots have few or none.

    Mitochondria in a Mouse

    • The percentage of cell volume contributed by mitochondria varies in different organs, such as the heart, brain, and pancreas.

    Levels of Organization

    • A tissue is a group of similar cells that perform a particular function.
    • Tissues form organs, which form organ systems.
    • Organ systems work together to maintain homeostasis.

    Cellular Communication

    • Cells in large organisms communicate through chemical signals passed from cell to cell.
    • There are three main ways cells signal: directly through gap junctions, exocytosis of signal molecules, and by a combination of gap junctions.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Explore how single-celled organisms and multicellular organisms maintain homeostasis. Learn about the importance of cells, tissues, organs, and organ systems.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser