作者：Rachael Kriete 5 月以前
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Red Light Absorption
Pulse allows us to deduce heart rate
One pulse per beat
Wave of high pressure blood passing along arteries
Thin walls
Squeezing
Adjacent Muscles
Gravity
Pocket Valves
Low pressure, risk of backflow
Continuous flow, no pulse
Semilunar Valves
Close during recoil, preventing backflow of blood to heart
Elastic Fibers
Reduce energy expenditure for blood transport
Store and release potential energy of Heartbeat
Narrow Lumens
High Velocity of Blood Flow
High BP
Layered Wall
Tunica Intima
Smooth Endothelium Lining
Tunica Media
Thick Smooth Muscle with Elastin
Vasodilation
Increases Blood Flow
Vasoconstriction
Reduces Flood Flow
Tunica Externa
Tough Outer Layer with Collagen
Density in tissues depends on needs of cells
All active cells close to a capillary
Fenestrated Capillaries
Glomerus of Kidney
Large Volume of Tissue Fluid
Large Pores
Endothelium cells
Pores between endothelium cells
Blood plasma, but not RBC
Extracellular fibrous proteins (gel) called basement membrane
Filters out macromolecules
10 micrometers diameter
Methods
Nail Varnish
Peeling Sample
Number of Stomata Per Unit Area of Leaf
Potometer
Environmental Factors
Humidity
Negative Correlation
Temperature
Positive Correlation
Evaporation in Leaves and Stems
Allowing Gas Exchange
Moist Surface
Spongy Mesophyll
Large Surface Area
Air Spaces Inside Leaf
Stomata
Close During Water Stress
Close at Night
Guard Cells
Avoiding Water Loss
Waxy Cuticle
Low permeability
Oxygen Waste
Carbon Dioxide Demand
Inspiratory Reserve
Vital Capacity
Tidal Volume
Muscles
Expiration
Volume Decreases, Pressure Increases
Internal Intercostal Muscles
Abdomen Wall
Inspiration
Volume Increases, Pressure Decreases
External Intercostal Muscles
Diaphragm
Differential Air Pressure
Pulmonary Surfactant
Prevents Adhesion
Reduces Surface Tension
300 mil in adult
40 x greater than outer surface
Collagen Fibers
Single Layer Wall
0.2 - 0.5 mm
