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Concept explainers
a.
To determine: The force that the bicep would generate when the distance of the fulcrum from the arm is 4 cm and the angle at which the arm must be held constant is 90°.
Introduction: The contraction and relaxation of the muscle cells are responsible for the movement of a particular part of the body. The amount of pressure generated depends on the number of sarcomere units that slide over. Greater the force required, more will be the muscle fibers that slide over one another.
To compare: The force needed when the point of insertion is 5 cm from the fulcrum to the force obtained when the distance of the fulcrum from the arm is 4 cm.
Introduction: The movement of the body is controlled by the contraction and relaxation of the skeletal muscles. A unit of muscle cells that undergoes contraction and relaxation is called sarcomere. The sarcomere is responsible for providing a striated appearance
b.
To determine: The force generated by the bicep when a band weighing 7kg is added on to the risk.
Introduction: Contraction in the muscle is important during weightlifting and the amount of force generated depends on the numbers of sarcomere units that slide over one another. Greater the force more will be the muscle fibers required that slide over one another.
To Compare: The force generated by the bicep when a band weighing 7kg is added on to the risk with the force if the object is placed 25cm away from the fulcrum.
Introduction: The force required to lift an object is directly proportional to the distance of the weight from the fulcrum and it is also dependent angle at which the weight has to be made stable.
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Chapter 12 Solutions
Human Physiology: An Integrated Approach Plus Mastering A&P with Pearson eText -- Access Card Package (8th Edition) (What's New in Human Physiology)
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- I’m struggling with this topic and would really appreciate your help. I need to hand-draw a diagram and explain the process of sexual differentiation in humans, including structures, hormones, enzymes, and other details. Could you also make sure to include these terms in the explanation? • Gonads • Wolffian ducts • Müllerian ducts • Testes • Testosterone • Anti-Müllerian Hormone (AMH) • Epididymis • Vas deferens • Seminal vesicles • 5-alpha reductase • DHT • Penis • Scrotum • Ovaries • Uterus • Fallopian tubes • Vagina • Clitoris • Labia Thank you so much for your help!arrow_forwardI’m struggling with this topic and would really appreciate your help. I need to hand-draw a diagram and explain the process of sexual differentiation in humans, including structures, hormones, enzymes, and other details. Could you also make sure to include these terms in the explanation? • Gonads • Wolffian ducts • Müllerian ducts • Testes • Testosterone • Anti-Müllerian Hormone (AMH) • Epididymis • Vas deferens • Seminal vesicles • 5-alpha reductase • DHT • Penis • Scrotum • Ovaries • Uterus • Fallopian tubes • Vagina • Clitoris • Labia Thank you so much for your help!arrow_forwardOlder adults have unique challenges in terms of their nutrient needs and physiological changes. Some changes may make it difficult to consume a healthful diet, so it is important to identify strategies to help overcome these obstacles. From the list below, choose all the correct statements about changes in older adults. Select all that apply. Poor vision can make it difficult for older adults to get to a supermarket, and to prepare meals. With age, taste and visual perception decline. As people age, salivary production increases. In older adults with dysphagia, foods like creamy soups, applesauce, and yogurt are usually well tolerated. Lean body mass increases in older adults.arrow_forward
- When physical activity increases, energy requirements increase also. Depending on the type, intensity, and duration of physical activity, the body’s requirements for certain macronutrients may change as well. From the list below, choose all the correct statements about the effects of increased physical activity or athletic training. Select all that apply. An athlete who weighs 70 kg (154 lb) should consume 420 to 700 g of carbohydrate per day. How much additional energy an athlete needs depends on the specific activity the athlete engages in and the frequency of the activity. Those participating in vigorous exercise should restrict their fat intake to less than 15%% of total energy intake. Athletes who are following energy-restricted diets are at risk for consuming insufficient protein. The recommendation to limit saturated fat intake to less than 10%% of total energy intake does not apply to athletes or those who regularly engage in vigorous physical activity.arrow_forwardWhen taking vitamins and vitamin-mineral supplements, how can one be sure they are getting what they are taking?arrow_forwardHow many milligrams of zinc did you consume on average per day over the 3 days? (See the Actual Intakes vs. Recommended Intakes Report with all days checked.) Enter the number of milligrams of zinc rounded to the first decimal place in the box below. ______ mg ?arrow_forward
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