BIO 126 Lecture Notes - Lecture 4: Trachea, Cytosol, Fetus
21 Mar 2016
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Document Summary
All animal cells share similarities in the ways in which they: exchange materials with their surroundings. Carbon dioxide, waste, excess water: obtain energy from organic nutrients. Used to fund processes: synthesize complex molecules. Lipids, proteins, carbohydrates, etc: reproduce themselves, detect and respond to signals in their immediate environment. Understand what is harmful and dangerous or helpful and key to survival. Cells with similar structure and function group to form tissues. Organs are linked to form organ systems. Muscle tissue: cells specialized to contract, generating force: skeletal muscle. Attached to bone or exoskeleton (for locomotion) Surrounds tubes and cavities (control diameter for propulsion of contents) Initiate and conduct electrical signals from one part of the animal"s body to another. Can extend from the brain down and can be very long. Electrical signals produced in a nerve cell may stimulate or inhibit other cells to. Initiate new action potentials in other neurons.
