50 Marks Physiology Essay

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These granules, composed of proteins and lipids, make their first appearance by age 20 and increase gradually, so that by age 80 they may occupy as much as 5–10 percent of the volume of a muscle fibre.

The heart also shows a gradual reduction in performance with advancing age.

This occurs because of the formation of collagen, a primary constituent of connective tissue, and between adjacent collagen fibres.

These changes in blood vessels occur even in the absence of the deposits on the arterial wall characteristic of While both systolic and diastolic blood pressures (blood pressures at contraction and dilation of the heart, respectively) increase with age, the rate of systolic increase exceeds that of diastolic so that the pulse pressure widens.

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Join Britannica's Publishing Partner Program and our community of experts to gain a global audience for your work!We may share your information with third-party partners for marketing purposes.To learn more and make choices about data use, visit our Advertising Policy and Privacy Policy.Thus, with increasing age, the heart becomes more vulnerable to cardiovascular disease.Even in the absence of detectable disease, the heart undergoes deleterious changes with advancing age.Since the probability of death increases rapidly with advancing age, it is clear that changes must occur in the individual which make him or her more and more vulnerable to cells from these organs, with resultant reduction in the reserve capacities of the individual.Furthermore, the cells remaining in the elderly individual may not perform as well as those in the young.By clicking “Accept and Continue” below, (1) you consent to these activities unless and until you withdraw your consent using our rights request form, and (2) you consent to allow your data to be transferred, processed, and stored in the United States.Whereas all the other A-level topics carry 24 marks each and are supposed to be completed in 30 minutes in the exam, Research Methods on paper 2 has 48 marks attached to it and 60 minutes in the exam.Human aging, physiological changes that take place in the human body leading to senescence, the decline of biological functions and of the ability to adapt to metabolic stress.In humans the physiological developments are normally accompanied by psychological and behavioral changes, and other changes, involving social and economic factors, also occur.


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