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Chapter 25-26
Excretory and Endocrine Systems
73
Biology
10th Grade
03/31/2011

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Term
Thermoregulation
Definition
the maintenance of internal temperature within narrow limits
Term
Osmoregulation
Definition
the control of the gain & loss of water & solutes
Term
Excretion
Definition
the disposal of nitrogen-containing wastes
Term
Very toxic nitrogenous waste (Aquatic organisms dispose this)
Definition
Ammonia
Term
What is the chemical formula for ammonia?
Definition
NH3
Term
A cup-shaped swelling which is the receiving end of the nephron
Definition
Bowman's Capsule
Term
Signals nephrons to step up water reabsorption
Definition
ADH
Term
What does ADH stand for? (Excretory System)
Definition
Antiduretic Hormone
Term
Blood to be filtered enters each kidney through here.
Definition
Renal Artery
Term
In this process, substances in the blood are transported into the filtrate.
Definition
Secretion
Term
This carries urine to the renal pelvis & has final refining in the filtrate
Definition
Collecting duct
Term
This dips down into the renal medulla & has a function in water reabsorption
Definition
Loop of Henle
Term
Organisms that excrete this avoid the water loss problem almost completely.
Definition
Uric Acid
Term
Blood that has been filtered leaves the kidney in the:
Definition
Renal Vein
Term
Ball of capillaries that helps to make up the blood-filtering unit of the nephron
Definition
Glomerulus
Term
Mammals excrete this substance in their urine
Definition
Urea
Term
[image]
Definition
Term
[image]
Definition
Term
How much urine is excreted on a typical day?
Definition
1.5 Liters of Urine
Term
Why are H+ ions secreted into the filtrate?
Definition
To keep the blood from becoming acidic.
Term
Hormone
Definition
A regulatory chemical that travels in the blood from its production site, usually an endocrine gland, to other sites, where target cells respond to the regulatory signal.
Term
Endocrine Gland
Definition
A ductless gland that synthesizes hormone molecules and secretes them directly into the bloodstream.
Term
Endocrine System
Definition
The organ system consisting of ductless glands that secrete hormones and the receptors of target cells, that cooperates with the nervous system in regulating body functions and maintaining homeostasis.
Term
Target Cells
Definition
A cell that responds to a regulatory signal, such as a hormone.
Term
Local Regulator
Definition
A chemical messenger that is secreted into the interstitial fluid and causes changes in cells very near the point of secretion.
Term
Neurosecretory Cell
Definition
A nerve cell that synthesizes hormones and secrets them into the blood and also conducts nerve signals.
Term
Steroid Hormone
Definition
lipid made from cholesterol that acts as a regulatory chemical activating the transcription of specific genes in target cells.
Term
Pineal Gland
Definition
Outgrowth of the vertebrate brain that secretes the hormone melatonin which coordinates daily and seasonal body activities such as the sleep/wake circadian rhythm with environmental light conditions.
Term
Thymus Gland
Definition
An endocrine gland in the neck region of mammals that is active in establishing the immune system; secretes several hormones that promote the development and differentiation of T cells.
Term
Hypothalamus
Definition
The "master control" ("master gland") center of the system, located in the ventral portion of the vertebrate forebrain. Functions in maintaining homeostasis, secretes hormones of the posterior pituitary and releasing hormones that regulate the anterior pituitary.
Term
Releasing Hormones
Definition
a kind of hormone released from the hypothalamus that makes the anterior pituitary secrete hormones
Term
Inhibiting Hormones
Definition
a kind of hormone from the hypothalamus that makes the anterior pituitary STOP secreting hormone
Term
Endorphins
Definition
The body's natural pain killer; hormone produced by the brain and anterior pituitary; also serves as a neurotransmitter
Term
What is a goiter?
Definition
An enlargement of the thyroid gland resulting from a dietary iodine definicieny
Term
What is negative feedback?
Definition
A self-regulatory system in which it feeds back to the input a part of a system's output so as to reverse the direction of change of the output.
Term
The regulation of hormone synthesis, blood glucose levels, body temperature, and blood pressure are examples of what?
Definition
Negative feedback
Term
Exocrine Glands
Definition
Have ducts; the Pancreas is one because it releases hormone into the bloodstream (making it endocrine) and it releases digestive enzymes via a duct into the small intestine.
Term
Which cells release insuline?
Definition
Beta cells
Term
What cells release Glucagon?
Definition
Alpha Cells
Term
What is Hyperthyroidism?
Definition
Too much T4 and T3 in the blood which leads to high blood pressure, loss of weight, overheating, and irritability; produces Graves' disease (goiters) [Think, the more iodine the less you weigh]
Term
What is Hypothyroidism?
Definition
Too little T4 and T3 in the blood which leads to low blood pressure, overweight, often cold and fatigued. [Think the less iodine, the more you weigh]
Term
What is Hypoglycemia?
Definition
Abnormally low blood glucose levels with too much insulin.
Term
What gland may control biorythms in some animals and control the onset of puberty in humans?
Definition
Thymus Gland
Term
What gland stimulates metabolic rate and is essential to normal growth and development?
Definition
Thyroid Gland
Term
What gland stimulates growth and stimulates secretion of hormones from other glands?
Definition
Testis
Term
What gland in females stimulates development of secondary sex characteristics, stimulates growth of sex organs at puberty, and prompts monthly preparation of the uterus for pregnancy?
Definition
Ovaries
Term
What is the major area where the nervous and endocrine systems interact?
Definition
Hypothalamus
Term
What gland controls blood glucose levels and determines the fate of glycogen?
Definition
The Pancreas
Term
What gland initiates stress response, increases heart rate, blood pressure and metabolic rate, dilates blood vessels, mobilizes fat and raises blood sugar levels?
Definition
Adrenal Glands
Term
What gland in males stimulates development of secondary sex characteristics, stimulates growth spurt at puberty, stimulates spermatogenesis?
Definition
Testis
Term
What gland increases blood calcium level, stimulates calcium reabsportion and activates Vitamin D?
Definition
Parathyroid Gland
Term
Oxytocin
Definition
In the Posterior Pituitary; stimulates the contraction of the uterus & gland cells
Term
ADH (Antidiuretic Hormone)
Definition
In the Anterior Pituitary; promotes retention of water by kidneys
Term
GH (Growth Hormone)
Definition
Anterior pituitary; stimulates growth & metabolic functions
Term
What is dwarfism?
Definition
A disease caused by a hyposecretion of GH
Term
What is giantism (gigantism)?
Definition
a disease caused by a hypersecretion of GH
Term
PRL (Prolactin)
Definition
Anterior Pituitary; Stimulates milk production in women
Term
Luteinizing Hormone (LH)
Definition
Anterior Pituitary; Stimulates ovaries & testes
Term
Thyroid Stimulating Hormone
Definition
Anterior Pituitary; Stimulated the Thyroid gland to make hormones
Term
ACTH (Adrenocorticotropic Hormone)
Definition
Anterior Pituitary; strimulates adrenal cortex to secrete glucocorticoids
Term
What is a disease related the Anterior Pituitary's adrenocorticotropic hormone?
Definition
Cushing's syndrome
Term
Thyroxine (T4) and Triiodothyronine (T3)
Definition
Thyroid Gland; strimulates and maintains metabolic processes
Term
Calcitonin
Definition
Thyroid Gland; lowers blood calcium level
Term
Parathyroid Hormone (PTH)
Definition
Parathyroid Gland; RAISES blood calcium level
Term
What does the release of epinephrine and norepinephrine do to the body?
Definition
"Fight or Flight" response; lowers pain, increases heart rate, dilates pupils, and increases breathing
Term
Glucocorticoids
Definition
Adrenal Cortex; increases blood glucose and reinforces effects of glucagon
Term
What is an example of a glucocorticoid?
Definition
Cortisone
Term
Progestins and Estrogens are found in what sex?
Definition
Females
Term
Androgens are found in what sex?
Definition
Males
Term
What does the Thymus gland produce?
Definition
Thymosine
Term
What does the Pineal Gland produce?
Definition
Melatonin (like silversun Pickups; P in pickups is like the P in Pineal)
Term
Which type of diabetes is insulin dependent, and auto-immune, where insulin-producing cells are destroyed?
Definition
Type 1
Term
What type of diabetes is non-insulin dependent, and caused by bad diet and inactivity resulting in stress on the pancreas, causing insulin deficiency or less response to it?
Definition
Type 2
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