5/17/2023 0 Comments Frog dissection worksheet answerPREPARATION - BY LAB TECHNICIAN General Preparations This practical requires only a few materials and takes a short time, yet provides students from a range of year levels with engaging, memorable lesson in anatomy. Exploring the internal systems of frogs provides a tangible example of various anatomical structures and how they function. It provides insight into evolutionary adaptations, such as the transition from an aquatic life to life on land. Dissection of preserved frogs is an established introductory activity into vertebrate anatomy and mature body systems. They provide a great model organism for a range of biological studies including, evolution, behaviour, anatomy, and physiology. In animals, the transport of materials within the internal environment for exchange with cells is facilitated by the structure and function of the circulatory system at cell and tissue levels (for example, the structure and function of capillaries) (ACSBL058)įrogs are vertebrates with specialised amphibian characteristics and behaviours.In animals, the exchange of nutrients and wastes between the internal and external environments of the organism is facilitated by the structure and function of the cells and tissues of the digestive system (for example, villi structure and function), and the excretory system (for example, nephron structure and function) (ACSBL057).In animals, the exchange of gases between the internal and external environments of the organism is facilitated by the structure and function of the respiratory system at cell and tissue levels (ACSBL056).The specialised structure and function of tissues, organs and systems can be related to cell differentiation and cell specialisation (ACSBL055). Multicellular organisms have a hierarchical structural organisation of cells, tissues, organs and systems (ACSBL054).All down to the level of atoms and molecules (Biology cannot exist without Chemistry or Physics). Something as complicated as sensing that truck is runnign towards you while you are crossing the road (sorry if my example is morbid) all relies on little Na and K ions. Now, the change in concentration inside and outsid eof cell helps creating resting emmbrane potential, depolarization, repolarization and generating action potential (that's how signal is porpagated).Īction potential jumps from Ranvier node to another and that way is faster conducted until it reaches synapse or final destination - where it is transmitted into sensation (in our brain) or into some action (efferent pathways). Which is more important, because our nervous sysem relies on transmitting neural signal (electrical current) we have to create that electrical field somehow - that's why we have ions. Since redox reactions happen in our body, as a consequence we have ions. So, we have ions in our cells and extracellular matrix. 'an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.' But if there was Na constantly moving in and K constantly moving out, why would this not keep a constant membrane potential? Is it because there wouldn't really be an resting membrane potential? I.e the membrane would never truly be at rest because of the different permeabilities and equilibrium potentials of the ions? Therefore an action potential would not be able to be created. If the whole purpose of the concentration gradients is to create an action potential, why can't the membrane be non polar and then instead of depolarising the membrane at threshold, it would merely, polarise it? this would still create an action potential would it not? I don't understand WHY there is a whole mechanism to maintain these gradients when an action potential could still be created if the membrane at rest was non polar. I understand the mechanisms, but what is the actual point in maintaining the concentration gradients?Īs the article states, if the sodium/potassium pump ceased to function, the concentration gradients would dissipate. The Na \text^ K start text, K, end text, start superscript, plus, end superscript against their electrochemical gradients.
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