Bio Two, Exam 4 terms

Hormone

signal molecules that are released into the blood

Hypothalamus

acts as a thermostat

Secretin

produced by S cells, signals pancreas to release bicarbonate

S Cell

Gastrin

stomach digestion releases this which triggers HCI release

Chyme

partially-digested food

CCK

triggers digestive enzymes from the pancreas

Parthenogenesis

individuals result from unfertilized eggs

Viviparous

animals that give birth to live young

Oviparous

animals give birth via eggs shed by mother

Ovum

mature female reproductive cell

Follicle-Stimulating Hormone

stimulates growth/recruitment of immature eggs

Luteinizing Hormone

triggers ovulation

Ovulation

release into fallopian tube

Estrous Cycle

Lining of uterus (endometrium) is absorbed

Menstrual Cycle

Lining of uterus is shed

Endometrium

Life History

traits that affected schedule of reproduction/survival

R-selected

selection of traits that are ideal in uncrowded environments

K-selected

selection of traits ideal in crowded environments

Distribution

where an organism is found

Dispersal

a long-distance movement with no return trip

Biotic

dealing with living things

Abiotic

dealing with non-living things

Demography

the study of population change

Survivorship

Carrying capacity

maximum number of individuals an enviroment can sustain

Competitive exclusion

In the absence of disturbance, one species outcompetes another

Fundamental niche

all of the potential resources that an organism can exploit in its environment, internal anatomy

Realized niche

resources organisms can exploit when competitors are present

Dominant Species

are the most abundant in a community

Keystone Species

maintain diversity within a community

Foundation Species

can dramatically alter the landscape of an ecosystem