- Flashcards
What are endocrine glands
Secrets products, hormones directly in blood rather than a duct
How do glands get their job done
Through secretion of hormones.
What controls hormone
Internal and external stimuli
Peptide hormones
.protein hormones
& growth
Synthesized from amino acids according to mRNA.
Inside cell nucleus
Steroid hormones
.located inside target cells in cytoplasm or buckets.
Fat molecules
External stimuli
Sensitivity
Internal stimuli
.based on a feeling
What are hormones
Chemical substances that affect the activity of a target site.
Messengers controlling and coordinating thruout the body
Most hormone systems are what type
Negative feedback
Ex of negative feedback system
Stimulus: rising blood glucose levels
Detected by insulin secreting pancreas
More cells take of glucose
Blood glucose declines and insulin releases
Stimulus declining
Glucagon cells release glycogen
Liver breaks down glycogen and releases glucose
Levels rose
Positive feedback ex
Baby pushes against cervix
Stretching occurs and impulses sent to brain
Oxytocin causes smooth muscle lining to contract
Endocrine most active during
Puberty
