ATI Fundamentals

All sample questions with matching correct answer in chapter 5 negative tropisms - Answer-growth away from a stimulus Define homeostasis - Answer-Homeostasis is the regulation of internal conditions in the body. It is necessary to maintain optimal conditions for body functioning. These internal conditions can change as a result of processes within the body and as external conditions change. systems responsible for homeostasis - Answer-the nervous system - uses electrical impulses to communicate the endocrine system - uses chemical molecules to communicate. what does the body need to control - Answer-blood glucose concentration body temperature water levels control systems in the body order - Answer-RECEPTOR -detect stimuli COORDINATION CENTRE -brain, spinal cord, pancreas -receives and process information from receptors EFFECTOR -muscles, glands -bring about responses which restore optimum levels what are neurones - Answer-Neurones are specialised for transmitting messages in the form of an electrical impulse. The part of the cell containing the nucleus is called the cell body. The cell body of all neurones is found in the CNS. Neurones, however, have an extended shape so that they can carry nerve impulses from one part of the body to another. Neurones also have fine branches at their tips to communicate with other neurones. what are receptors - Answer-Receptors are cells that detect any changes in the environment. Receptors are sometimes grouped to form sense organs. Sensory neurones relay nerve impulses from these receptors to the CNS. The CNS processes the information and coordinates how the body should respond. Motor neurones relay impulses from the CNS to the effector - for instance, a muscle or gland.