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EK Bio Lec4
Important notes/words from Examkracker's Biology Lecture 4
Question | Answer |
---|---|
What do secretory vesicles contain? | They contain enzymes, growth factors or extracellular matrix components |
What are adipocytes? | They are cells that contain predominately fat droplets |
What are adipocytes important for? | These cells are important for energy storage and body temperature regulation |
What are the roles of smooth ER? | 1. Take part in glycolysis 2. Produce trigylcerides 3. Cholesterol formation 4. Oxidizes bad stuff |
What are peroxisomes? | Self-replicating vesicles in the cytosol that grow by incorporating lipids/proteins from cytosol |
What is the role of peroxisomes? | 1. Breakdown hydrogen peroxides 2. Inactivate toxic substances 3. Regulate oxygen concentration 4. Help in lipid synthesis/breakdown 5. Metabolize nitrogenous bases and carbs |
What is the axoneme? | The major portion of flagella and cilia containing 9 pairs of microtubules circling 2 lone microtubules |
What is dynein? | A protein that forms cross bridges of microtubules |
What are the roles of microfilaments? | 1. Contracting force in muscles 2. Cytoplasmic streaming 3. Phagocytosis 4. Microvillli movement |
What are tight junctions? | Junctions that forms a watertight seal blocking water, ions and other molecules |
What are desmosomes? | Junctions that join two cells at a single point and attach directly to cytoskeleton and found in cells that experience a lot of stress |
What are the roles of an extracellular matrix? | 1. Provide structural support 2. Determine cell shape and motility 3. Affect cell growth |
What are the three classes of cells that make up animal cell matrices? | 1. glycoaminoglycans and proteoglycans 2. structural proteins 3. adhesive proteins |
What governes hormones? | The endocrine system gorverns these |
What governes neurotransmitters? | The nervous system governs these |
What is characteristic of neuronal communication? | It is rapid, direct amd specific |
What is characteristic of hormonal communication? | It is slower, spread throughout the body and affect many cells/tissues in different ways |
What compromises the nervous system? | This is composed of the brain, spinal cord, nerves and neural support cells and certain sense organs |
How can action potentials differ? | They can differ in shape, durection and types of ions |
How is a neurotransmitter removed? | 1. Enzyme 2. Absorbed by presynaptic vell 3. Diffuse out of synaptic cleft |
What are microglia? | Glial cells that phagocytize microbes/debris in CNS |
What are ependymal cells? | Glial cells that are epithelial cells that line the space containing cerebrospinal fluid |
What are satellite cells? | Glial cells that support ganglia |
What are astrocytes? | Star-shaped shaped glial neuroglia om CNS that support neurons and help maintain mineral and nutrient balance |
What is saltatory conduction? | This is the jumping of an action potential from one node of Ranvier to the next |
What are sensory (afferent) neurons? | Neurons that receive signals from a receptor cell that interacts w/environment (located dorsally) |
What are interneurons? | Neurons that transfer signals from neuron to neuron |
What are motor (efferent) neurons? | Neurons that carry signals to muscles/glands (located ventrally) |
What does the CNS consist of? | This consist of interneurons and support tissue in brain and spinal cord |
What is the function of the CNS? | This system integrates signals from sensory and motor neurons |
What is the somatic nervous system? | The part of the PNS that responds to external environment |
Where to the motor portions of the ANS conduct their signals? | Smooth muscle, cardiac muscle and glands |
What does the sympathetic ANS deal with? | "fight or flight" response |
What does the parasympathetic ANS deal with? | "rest and digest" response |
What does the lower brain consist of? | Medulla, hypothalamus, thalamus, and cerebellum |
What is the role of the lower brain? | To integrate subconscious activities |
What does the higher brain consist of? | The cerebrum/cerebral cortez |
What is the role of the higher brain? | To store memories and process thoughts |