The Excretory System • Main functions of the excretory system are: o to concentrate wastes and expel them from the body o to regulate fluids and water within the body • Most metabolic wastes and toxins are dissolved in the body’s internal environment‚ so the maintenance of the body fluids is essential for keeping the body free of waste products enabling it to function properly. Excretion in Invertebrates and Non-mammaliam Vertebrates • Single celled organisms and simple multicellular
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Assignment The name of the cell organelle‚ or structure‚ to which each of the following statements refers: a)Fully permeable layer found outside the membrane of some cells. Cell Wall b)Series of membranes in the cytoplasm through which materials can be transported and in which proteins accumulate. Endoplasmic Reticulum c)Site of ribosomal RNA synthesis. Nucleus d)Partially permeable layer about 7.5nm thick. Cell Membrane e)Structures responsible for producing spindle apparatus. Centrosomes f)Contains
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1. How does a cell become differentiated? A cell becomes differentiated by using only the DNA that it needs. 2. Give an example of 2 differentiated cells. Two examples of differentiated cells are lysosomes and mitochondria. Lysosomes are small so they can move throughout the cell effectively. Mitochondria have a lot of surface area to make more energy 3. (Essay) What does it mean to be specialized? Explain how the structure of the cell determines its function. Give at least 3 examples. Being specialized
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types of this easy movement of molecules. You may also see proteins in the cell membrane that act as channels to help the movement along. Of course there is an in-between transport process where very small molecules are able to cross a semi-permeable membrane. Proteins are used to help move molecules more quickly. Since the cell membrane will not allow glucose to cross by diffusion‚ helpers are needed. The cell might notice outside fluids rushing by with free glucose molecules. The
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weight because the solute is moving toward the water. The potato in the salt water lost weight because the salt was at a high concentration level so it moved to an area of low concentration. Osmosis is the diffusion of water across a selectively permeable
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potassium channels are open. 4. Discuss the relative permeability of the membrane to Na+ and K+ in a resting neuron. Your answer: Membrane permeability to sodium is very low because there are only a few sodium leak channels. The membrane is more permeable to potassium because of the higher number of potassium leak channels. 5. Discuss how a change in Na+ or K+ conductance would affect the resting membrane potential. Your answer: The resting membrane potential depends on the intracellular and
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living organisms to control or regulate changes in their internal environment G. Diffusion - The movement of molecules from an area of high concentration to an area of low concentration H. Osmosis - The diffusion of water across a selectively permeable membrane I. Osmoconformer - An organism that allows its internal concentration of salts to change in order to match the external concentration of salts in the surrounding water J. Osmoregulator - An organism that allows its internal concentration
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what types of plants can survive in that region. Sunlight‚ temperature and precipitation all play a whole in which plants will grow where. * What is aquifer? a body of saturated rock through which water can easily move. Aquifers must be both permeable and porous and include such rock types as sandstone‚ conglomerate‚ fractured limestone and unconsolidated sand and
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movement. The particles move from a region of high concentration to an area of low concentration or move down the concentration gradient (BBC‚ GCSE BiteSize 2014). Osmosis is a type of diffusion where a spontaneous amount of water moves through a semi-permeable membrane from a region of low solute concentration to an area of high solute concentration in order to reach equilibrium; to become isotonic. To be isotonic means have an equal percentage of solute concentration of either side of the membrane which
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digests and breaks down lipids‚ carbs‚ and proteins. Nuclear Pore- Dots on the envelope which allows material in the and out of the nucleus. Cell Membrane- It surrounds the cell and regulates what enters and leaves the cell. It is selectively permeable which means only certain materials can cross the membrane. Nuclear Envelope- It surrounds the nucleus. Rough ER- Is involved in some protein production‚ protein folding‚ quality control‚ and despatch. It’s called Rough ER because it’s studded
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