This document provides study material for Bioscience 1 Assessment 2 (Part B). It includes a feedback review on Part A, short answer questions on the cardiac conduction system and vitamin B12, and information on the components and conduction pathway of the cardiac conduction system.
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Bioscience 1 Assessment 2 (Part B) Do NOT delete any part of the template Due Monday 6thMay 2019, midnight Student Name: Student ID: Task 1- Feedback review on Part A This activity is to be completed and submitted as part of Assessment 2 (Part B). This activity should bring to your attention the importance of referencing and paraphrasing and help to improve your marks awarded for Academic Style and Referencing. Use your submitted Assessment 2 (Part A) when considering the following questions.Pleasehighlightorunderlineyour chosen answer. a)Did you include in-text references in your answer and a reference list at the end? a)Yes b)No b)What is the purpose of including in-text references and a reference list in an assessment? a)Provide evidence for the source of the information b)Allows information to be included without paraphrasing c)Permits information to be directly copied without rewriting c)What is the purpose of submitting your assessment through Turnitin? a)Allows you to identify material that needs to be referenced b)Allows you to identify material that needs to be paraphrased c)Allows you to identify incorrect information that should be removed d)Which of the following Turnitin similarity percentages best represents an assessment that has beenwellparaphrased? a)80-95% b)50-60% c)10-30% Make sure you include in-text references in every answer and check your Turnitin similarity % at least three days before the due date so you have time to paraphrase your answers.
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Bioscience 1 Assessment 2 (Part B) Task 2- Short answer questions. Note: Answers must be in complete sentences and include in-text references Answer the following questions: Question 2- Describe the components and conduction pathway of the cardiac conduction system of the heart.(200 words, 5 marks) Answer:Cardiac conduction can be defined as the rate at which electrical impulses are conducted by the heart (Peate & Nair, 2015). The cardiac conduction system of heart consists of 5 elements such as the Sino-arterial node (SA node) located in the right arterial wall, and initiates the electrical impulse (Peate & Nair, 2015). The impulse reaches the atrioventricular (AV), on the right side of the interventricular septum (Here the impulse is delayed by tenth of one second) (Peate & Nair, 2015). The electrical conduction is transmitted from the AV node to the point of the apex by the help of Bundle of His. The action potential gets conducted from the atria to the ventricles (Peate & Nair, 2015). The electrical impulses within the ventricles of the heart are transmitted by left and right bundle branches that are specialised impulse conducting fibres.After leaving the Bundle of His, the wave of cardiac impulse then spreads to the Purkinje fibres that make up the branches of the left and the right bundle (Marieb, 2018). These branches carry electrical impulse to the apical region of both the left and the right ventricles (Marieb, 2018). Finally, the signal travels broadly through the remainder of the Purkinje fibre causing a synchronise contraction of the ventricles (Marieb, 2018). Relate the conduction system to the corresponding sequence of heart chamber contractions.(200 words, 5 marks)
Bioscience 1 Assessment 2 (Part B) Answer: The initial step of the cardiac conduction is the generation of the impulse.At the time of diastole, the atria and the ventricles are relaxed causing the deoxygenated blood from the inferior vena cava and superior vena cava to enter the right atrium (Peate & Nair, 2015).With the contraction of the SA node, the cardiac impulses travels through the heart wall causing both the arteries to contract (Marieb, 2018). The atria contract and empty their content in to the ventricles before the contraction of the ventricles (Marieb, 2018).During the first systole phase the right ventricle receives impulse from the Purkinje fibres and contraction takes place. The semilunar valves open and the deoxygenated blood is pumped in to the pulmonary artery, which carrier back the blood back in to the lungs for gaseous exchange(Peate & Nair, 2015). In the second diastole phase semilunar valves close and he arterioventricular valves open and blood rushes in to the left atrium by the pulmonary veins. The contraction of SA node takes place, the arteries contract and empties the content in to the left ventricle. During the second systole phase, the atrioventricular valves close and semilunar valves open(Peate & Nair, 2015). The impulse reaches left ventricles from the Purkinje fibre and the ventricles contract and oxygenated blood is pumped into aorta and the aorta branches out to supply blood to all the body parts(Peate & Nair, 2015).
Bioscience 1 Assessment 2 (Part B) Question 3-Vitamin B12 is an essential nutrient that is important for normal development and health. Please answer the following: a)Name two food sources high in vitamin B12(20 words; 0.5 mark) Answer: Animal liver and fortified foods (Medline Plus, 2019). The lamb liver is higher in vitamin B12 than beef or veal liver (National Institutes of Health - The Office of Dietary Supplements, 2011). b)Describe the functions of vitamin B12 in the body(60 words; 1.5 marks) Answer: Vitamin B12 helps in the normal functioning of the brain and the synthesis of the red blood cells (Green et al., 2015).It helps in the prevention of a type of anaemia called the megaloblastic anaemia making people tired and weak. One of the vitamin B 12 complex helps to convert glucose in to energy and has a role in nerve activities (Green et al., 2015).
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Bioscience 1 Assessment 2 (Part B) c)Describe the possible consequences to the body if there is a deficiency in vitamin B12 in pregnant and non-pregnant individuals(80 words; 2 marks) Answer: Deficiency of vitamin B 12 in pregnant woman might lead to the premature birth and miscarriage and increases the chance of neural tube defects like spina bifida, that causing partial paralysis and anencephaly , a fatal condition in which the brain and the skull is severely underdeveloped (National Institutes of Health - The Office of DietarySupplements, 2011). In non- pregnant women, vitamin B 12 deficiency might cause a reduction in the formation of the red blood cell and prevents them from growing properly and in the synthesis of fatty acids and the production of energy (Finkelstein, Layden & Stover, 2015). Name one group of people that is more likely to be at risk of becoming deficient in vitamin B12 and why.(40 words; 1 mark) Answer: Vegans, who does not eat dairy, milk, egg and meat are at the risk of developing Vitamin B-12 deficiency because, vegans only have to rely on fortified cereals and a large part of vitamin B-12 comes from animal products (Medline Plus, 2019). .