Endocrine & Reproductive System Flashcards
Nervous system vs endocrine system and there similarities
Nervous - uses nerve impulses and chemical messengers called neurotransmitters
Endocrine - uses several mechanisms involving chemical messengers called hormones
Functions of both - communication, coordination and control systems of the body
Hormones
Made by endocrine glands, travel through the bloodstream and exert their action on TARGET CELL
True or false: endocrine responses are FASTER, and hormonal effects are more LOCALIZED compared with the nervous system
False: slower; widespread
Where do endocrine glands secrete hormones?
Directly into bloodstream or tissues; don’t posses ducts and are called DUCTLESS GLANDS
Where do Exocrine glands secrete their products? What are some types of glands fall under exocrine?
Into ducts that open to body cavities, the center of a hollow organ, or onto the surface of the body
Sudoriferous, sebaceous, and salivary
Functions of the endocrine system
1) hormone production and secretion
2) regulation of metabolism - some hormones regulate growth, development, nutrient absorption, and energy metabolism; some hormones regulate the metabolic activity of other glands and organs
3) stress adaptation - some hormones help the body respond or adapt to stress during period of infection, trauma, dehydration, and anxiety
4) chemical composition and fluid volume regulation - hormones regulate body fluid balance and electrolytes balance
5) reproductive process regulation - some hormones regulate the reproductive process, including gamete production, fertilization, pregnancy, childbirth, and lactation
Target cell
Posses receptors for corresponding hormone; when hormones come into contact with receptors sites on their target cells, they fit like puzzle pieces
Negative feedback system
Information about the hormone or the effects of that hormone are fed back to the gland that secretes the hormone
Negative feedback
Aka balancing feedback, Response of an endocrine gland to a stimulus that moves hormones levels in the opposite, or negative, direction
This movement brings hormone levels toward homeostasis
Biorhythm
Mechanisms that control plasma levels of some hormones; rhythmic alteration in a hormones rate of secretion
Circadian rhythm
24 hour rhythm; pattern repeats every 24 hours
Cortisol secretion
Highest in the morning hours (peak at around 8am) and lowest in the evening hours (lowest at midnight)
What are two ways your CNS help control the secretion of hormones?
1) activation of hypothalamus
2) stimulation of the sympathetic nervous system
Neural regulation
Hormone release stimulated by nerve impulses
Hormone regulation
Involves hormone release from one
Endocrine gland regulating the hormone release from another endocrine gland
What are hormones that stimulate the activity of other endocrine glands called? (Hint: most anterior pituitary hormones are this type)
Tropic hormones
Hypothalamus
Located in the diencephalon of the brain and secrets hormones that stimulate or inhibit the release of pituitary hormones; also regulated autonomic nervous system, providing a link between the endocrine and nervous system;
What is considered the master gland?
Pituitary glands (aka hypophysis) bc it controls or affects many other endocrine glands
Two main ways the hypothalamus controls the pituitary gland
1) secretion of the anterior pituitary hormones is controlled by the hypothalamus (hypothalamus secretes hormone called releasing hormones and releasing-imbibing hormones)
2) secretion of anti diuretic hormones, or ADH, and oxytocin
What are the parts of the pituitary gland?
can be divided into 2 or 3 parts, depending on if you count the middle lobe
- Anterior pituitary gland (or adenohypophysis)
- Posterior pituitary gland (or neurohypophysis)
Infundibulum
a short, slender stalk where the pituitary is attached to the undersurface of the hypothalamus
What is the role of Tropic Hormones? where do they secrete from? Name some examples
- aimed at and control other glands
- from the adenohypophysis
Examples
- thyroTROPIN
- thyroid stimulating hormone (TSH)
- adrenocorticoTROPIC
- gonadoTROPIC Hormone
- luteinizing hormone (LH)
Endorphins and Enkephalins
CHEMICALS produced in the pituitary gland and can REDUCE or ELIMINATE PAIN and produce feelings of HAPPINESS or EUPHORIA
What 3 hormones are concerned with regulating SALT and WATER RETENTION and EXCRETION?
aldosterone, atrial natriuretic hormone/peptide, vasopressin (ADH)
What is produced by the THYROID GLAND and is responsible for regulating metabolism? (hint: IODINE is needed for the thyroid to produce this)
T3 & T4
What does the parathyroid hormone help regulate?
INCREASES blood calcium levels and is secreted by the PARATHYROID GLAND; releases calcium from BONE TISSUE by stimulating OSTEOCLASTIC (bone-breakdown) activity
What is Calcitonin good for?
DECREASES blood calcium levels and is secreted by the THYROID GLAND; it stimulates OSTEOBLASTIC (bone-making) activity
hack: “calci” = calcium, “ton” = alot, “in” = like into
{alot of calcium into the bone}
Parts of the adrenal gland
- cortex: the outer part
- medula: the inner part
hack: outer part of any organ = cortex while inner part = medula
Parts of the adrenal gland
- cortex: the outer part
- medula: the inner part
hack: outer part of any organ = cortex while inner part = medula
Pineal Gland: shape, location, common nickname, and secretion
- cone-shaped gland
- located near the thalamus in the brain
- nicknamed “biological clock” bc it controls many BIORHYTHMS
- secretes melatonin