Down regulation of receptors makes a target cell less responsive to a hormone. -True true Most water soluble hormones must be attached to a transport protein in order to be circulated. -True false Which of the following is not a true statement? -most hormone systems function under a positive feedback system -secretion of hormones occurs in short bursts -signals from the nervous system regulate hormone secretion -chemical changes in the blood may determine concentration of hormone release -regulation of secretion prevents overproduction of a hormone most hormone systems function under a positive feedback system The male and female gonads are considered reproductive and endocrine organs. -True true The two major systems that act together to coordinate functions of all body systems are the: -cardiovascular and nervous systems nervous and endocrine systems
Follicle stimulating hormone is responsible for triggering ovulation and the release of the secondary oocyte. -True false An increase in the blood osmotic pressure will stimulate the release of -oxytocin ADH Which hormone lowers blood glucose level? -glucagon insulin Which of the following hormones contributes to setting the circadian rhythm? -insulin melatonin Which of the following is BOTH endocrine and exocrine? -1 only 1, 2, and 3 Which of the following statements is/are incorrect? -The nervous and endocrine systems act together to help to maintain homeostasis. -The nervous system acts through nerve impulses while the endocrine system uses hormones to control body activities. -The endocrine uses neurotransmitters for communication while the nervous system communicates using hormones. -Neurotransmitters and hormones may both exert effects by binding to target cell receptors. -The endocrine system responds slowly while the nervous system responds quickly. The endocrine uses neurotransmitters for communication while the nervous system communicates using hormones Which of the following statements is incorrect? -Down-regulation may occur if a hormone is present in excess. -Down- regulation results in an increase in the number of target-cell receptors. -In up-regulation, a target cell becomes more sensitive to a hormone. -If a hormone is present in excess, the number of target cell receptors decreases. Down-regulation results in an increase in the number of target-cell receptors Most water soluble hormones circulate freely in blood plasma while most lipid soluble hormones are transported bound to transport proteins. -True true The responsiveness of a target cell to a hormone is determined by: -The concentration of the hormone in the blood all of these determine the responsiveness of a target Three types of signals that control hormone secretion are nervous system signals, chemical changes in blood, and other hormones. -True true The level of blood glucose controls secretion of insulin and glucagon by negative feedback. -True true Chemicals produced by endocrine cells reach their intended recipients by traveling through the bloodstream. -hormones hormones Hormones produced by endocrine cells reach their intended recipients by traveling through the bloodstream. -True true Hormones which cannot pass through the cell membrane must attach to ___ on the cell surface to affect the cell. -enzymes receptors Cells affected by hormones are known as -receptor cells target cells The type of hormone, such as a steroid, which passes directly through the cell membrane to nuclear receptors to cause changes in gene expression within the cell are known as -isotonic hormones hydrophobic hormones In order for a hydrophobic hormone to travel through the bloodstream, it requires a hydrophilic carrier protein. -True
true When hormones attach to nuclear receptors, the general result is -the formation of triglycerides the synthesis of new proteins When a hormone attaches to a receptor on the outside of the cell a second messenger mechanism is activated with results in an "enzyme cascade" which means -the second messenger causes the activation of many enzymes which activate even more enzymes. -once one enzyme decomposes, it causes many enzymes to decompose -all enzymes attached to the outside of the cell membrane fall off -enzymes accumulate in a mass which is then surrounded by a membrane to form a lysosome the second messenger causes the activation of many enzymes which activate even more enzymes Hormones released by endocrine glands must bind to a cellular receptor to create a response. -True true Lipid soluble hormones bind to intracellular receptors. -True true Proteins produced by a hormone-receptor binding will alter the cell's activity. -True true Lipid insoluble hormones can pass through the plasma membrane. -True false Which of the following is NOT a function of a hormone? -Regulates chemical composition and volume of the internal environment produces electrolytes When a hormone is present in excessive levels, the number of target-cell receptors may decrease. This is called -receptor recognition. down-regulation Which of the following anterior pituitary hormones stimulates milk production? -Luteinizing hormone prolactin |
Glucose transportation into the cells through cell membranes takes place in which order Quizlet
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