Cells+hw-kat

(1) What is a Cell? A cell is the smallest unit that displays the properties of life.

(2) What does the cell theory state? The cell theory states that all organisms are made up of cells and cells come only from preexisting cells.

(3) Why are cells so tiny? Cells are so tiny due to the surface area-to-volume ratio.

3.2 Evolutionary History of the Human Cell (4) What are the three main parts of a eukaryotic cell? The three main parts of a eurkaryotic cell are the nucleus, the plasma membrane, and the cytoplasm.

(5) Which of these also occur in prokaryotes (bacteria)? Which one does not occur? In a prokaryotic cell, there is a plasma membrane and the cytoplasm. They lack a nucleus.

(6) How might the nucleus, the endomembrane system, and two of the organelles in eukaryotic cells have arisen? The nucleus, the endomembrane system, and two of the organelles in eukaryotic cells could have arisen from the archea who lived in extreme conditions. The conditions could have too salty, too hot, or too acidic.

Chapter 4 TISSUES (7) What is a tissue?
 * Tissue** is a group of cells that work together to do the same thing.

(8) What are the four major types of tissues found in the human body? Also describe each one. Pictures would be nice. The four major types or tissues are connective tissue, muscular tissue, nervous tissue, and epithelial tissue.
 * **Connective tissue** binds and supports our body
 * [[image:connective_tissue.jpg]]
 * **Muscular tissue** provides the body with movement
 * [[image:muscular_tissue.jpg]]
 * **Nervous tissue** responds to stimuli and sends impulses to the central system
 * [[image:nervous_tissue.jpg]]
 * **Epithelial tissue** covers the whole surface of the body
 * [[image:epithelial_tissue.jpg]]