![]() HAPS Learning Outcome: B03.3 Provide an example of a positive feedback loop in the body. Describe a positive-feedback mechanism and give an example. Topic: Examples of homeostatic mechanisms HAPS Learning Outcome: B02.3 Explain why negative feedback is the most commonly used mechanism to maintain homeostasis in the body.ġ2) Which of these is an example of a positive-feedback mechanism?Ī) An increase in blood pressure activates mechanisms that decrease blood pressure.ī) Increased amounts of a hormone in the blood cause a decrease in the secretion of that hormone.Ĭ) Increased carbon dioxide in the blood increases breathing rate, which decreases carbon dioxide in the blood.ĭ) Increased amounts of fluid in the blood result in increased quantities of urine, which decreases the fluid content of the blood.Į) Increased stretch of the uterus causes it to contract, which further increases stretch. Describe a negative-feedback mechanism and give an example. HAPS Learning Outcome: B01.1 Define homeostasis.ġ1) Which of these statements is true of negative feedback?Ī) Negative feedback is important for maintaining homeostasis in the body.ī) Negative feedback makes any deviation from a normal value larger.Ĭ) Negative feedback occurs when the uterus contracts during childbirth.ĭ) Negative feedback is a very unusual control mechanism in the human body.Į) Negative feedback will usually result in illness or other disturbance of normal systems. Define homeostasis, and explain why it is important for proper body function. HAPS Learning Outcome: A06.1 Describe, in order from simplest to most complex, the major levels of organization in the human organism.ġ0) Homeostasis is the condition produced byī) the tendency for change in a body variable to be counteracted as soon as the body variable goes past its normal range of values.Ĭ) the tendency for continued change in the same direction regardless of current values of a body variable. Describe the six levels of organization of the body, and describe the major characteristics of each level. Section: 01.03 Structural and Functional Organization of the Human Body It can result fromĪ) an increase in the number of cells within the organism.ī) an increase in the size of individual cells within the organism.Ĭ) an increase in the amount of substances surrounding the cells.ĥ) _ includes the changes an organism undergoes through time beginning with fertilization and ending at death.Ħ) _ refers to the ability of an organism to sense changes in the environment and make adjustments needed to help maintain its life.ħ) Which of these characteristics of life means "The ability to use energy to perform vital functions"?Ĩ) According to the six criteria given as the characteristics of life (organization, metabolism, responsiveness, growth, development, and reproduction), is a virus such as HIV "alive"?ī) No, it has none of the 6 characteristics.Ĭ) Unknown, it has one characteristic (when not including its host cell's components) but does not have the rest.Ī) involves the interaction between atoms and the formation of molecules.ī) is made up of organ systems that are classified as a unit by function.Ĭ) determines the structural and functional characteristics of all organisms.ĭ) Both "involves the interaction between atoms and the formation of molecules" and "determines the structural and functional characteristics of all organisms" are correct. List and define six characteristics of life.Ĥ) Growth refers to an increase in size of all or part of an organism. HAPS Learning Outcome: A05.2 Give specific examples to show the interrelationship between anatomy and physiology.ģ) _ refers to the specific interrelationships among the parts of an organism and how these parts interact to perform functions. Learning Outcome: 01.01B Explain the importance of the relationship between structure and function. HAPS Learning Outcome: A05.1 Define the terms anatomy and physiology.Ģ) Which of the following statements is TRUE?Ī) The coordinated activity of the organ systems is necessary for normal function.ī) Because organ systems are so interrelated, dysfunction in one organ system can have profound effects on other systems.Ĭ) An organism is any living thing considered as a whole whether composed of one cell such as a bacterium or trillions of cells such as a human.ĭ) Living things are highly organized, and disruption of this organized state can lead to loss of function and death. 1) The scientific discipline that deals with the processes or functions of living organisms is _.
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