Lecture 2 Cells & Tissues Flashcards
What is a cell?
A single unit or compartment, enclosed by a border (plasma membrane); usually part of a larger structure
Role of the Nucleus?
Has DNA
Controls shape and activity through protein synthesis
Exports genetic information as RNA via the nucleolus
Whats the role of the Plasma membrane?
Limits the outside of the cell and interacts with the environment through secretion and absorption
What is the Passive Process?
Passive transport does not require energy
What is the Active process?
Active transport requires the use of energy (ATP)
Where do you find Smooth Muscle tissue?
No striations, one nucleus, walls of hollow organs) Stomach
Where do you find Cardiac Muscle tissue?
Composes the walls of the hearth, striated cells are generally uninucleate
Where do you find Skeletal Muscle tissue?
Aattached to the bones, long cylindrical striated cells, many nuclei)
What is Diffusion?
Movement of molecules from a region of higher concentration to a region of lower concentration
What is Facilitated Diffusion?
Membrane proteins (carriers) transport molecules across the cell membrane following a concentration gradient
What is Osmosis?
Movement of water through a semipermeable membrane
What does Ribosomes equal?
Site of protein synthesis
Where does the Endoderm tissue come from?
Epithelial linings of the digestive, respiratory, and urogenital systems
What is the Regeneration of Tissue repair?
Replacement of damage tissue with same functional tissue
What is the Fibrosis of Tissue repair?
Fibrous connective tissue replaces the functional tissue
What is part of the Cell Theory?
- All organisms are composed of cells
- Cells are the smallest living things
- The activity of an organism depends on the activity of its cells
- Shape, form and structure dictate its activity
- Cells arise only from pre-existing cells
Differences between Prokaryotes Vs. Eukaryotes?
Eukaryotes are more complicated
Plant cells
Animal cells
Bacteria are the best examples of prokaryotes
Whats the role of the Cytoplasm?
Surrounds the nucleus and carries out the main functions using specific organelles (‘little organs’)
What is Cellular Transport?
Movement of substances across the cell membrane
Where does the Ectoderm tissue come from?
Nervous system as well as skin
Where does the Mesoderm tissue come from?
Forms all other tissues
What does Active Transport do?
Substances are moved from a region of low concentration to a region of high concentration
