1. Physiology Coordination Between Systems Circulatory and Respiratory
Circulatory and Digestive
Nervous and Muscular
Endocrine and Excretory

2. Respiratory and circulatory
ALVEOLI increase surface area to increase gas exchange
CAPILLARIES surround alveoli to allow diffusion of gasses from alveoli space into blood, from high to low concentrations

3. Digestion and Circulatory
VILLI and MICROVILLI are projections of the small intestine that increase surface area to increase nutrient absorption
Tiny capillaries line these microvilli to capture absorbed nutrients that are absorbed by the thin SI wall

4. Absorption of Nutrients

5. Nervous and Muscular Nerve sends message to muscle
NEUROTRANSMITTER acetylcholine from nerve axon terminal received by muscle tissue
Causes signal transduction, allowing actin and myosin to slide past each other

7. Endocrine and Excretory
NEPHRONS of kidney regulate ion and water concentration that is used to produce urine
ADH and aldosterone are hormones that stimulate the end of the nephron, the collecting duct, to increase or decrease water reabsorption, back into blood