By Tortora G., Derrickson B.
В учебном пособии изложены основы анатомии и физиологии человека.
Read Online or Download Introduction to the Human Body. The Essentials of Anatomy and Physiology PDF
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Extra info for Introduction to the Human Body. The Essentials of Anatomy and Physiology
Example text
2). 1. A receptor is a body structure that monitors changes in a controlled condition and sends information called the input to a control center. Input is in the form of nerve impulses or chemical signals. Nerve endings in the skin that sense temperature are one of the hundreds of different kinds of receptors in the body. 2. 2 Parts of a feedback system. The dashed return arrow to the right symbolizes negative feedback. The three basic elements of a feedback system are the receptor, control center, and effector.
Qxd 8/26/08 6:49 PM Page 7 Homeostasis: Maintaining Limits Each body system contributes to homeostasis in some way. For instance, in the cardiovascular system, alternating contraction and relaxation of the heart propels blood throughout the body’s blood vessels. As blood flows through the blood capillaries, the smallest blood vessels, nutrients and oxygen move into interstitial fluid and wastes move into the blood. Cells, in turn, remove nutrients and oxygen from and release their wastes into interstitial fluid.
Reproduction bone d. digesting and absorbing your food from breakfast e. the initial development of the nervous system in a fetus f. the pediatrician noting the increased head circumference of a four-month-old baby 7. Which of the following body system(s) is(are) the primary controller(s) of homeostasis? a. respiratory b. nervous c. endocrine d. cardiovascular e. urinary 8. The part of a feedback system that receives the input and generates the output command is the a. effector b. receptor c. feedback loop d.
