b4 Flashcards
name the 4 main components of blood
red blood cells
white blood cells
plasma
platelets
what is the function of platelets
form blood clots - prevents the loss of blood
how does the structure of an artery relate to its function
carries blood away from the heart under high pressure
how does the structure of a vein relate to its function
carries blood back to the heart at low pressure
how does the structure of a capillary relate to its function
carries blood to cells and tissue
list the structures air passes through when breathing in
mouth/nose , trachea , bronchi , bronchioles , alveoli
what is the function of red blood cells
bind to oxygen and transport it around the body
what is the function of white blood cells
defend the body against pathogens
what is the function of plasma
transports blood cells and substances around the body
why is a leaf and organ
there are many tissues inside the leaf that work together to preform photosynthesis
how is the palisade mesophyll adapted for its function
tightly packed cells with lots of chloroplasts to absorb light for photosynthesis
how is the spongy mesophyll adapted for its function
air spaces increase the surface area allowing gases to diffuse faster
what is the function of guard cells
control the opening and closing of stomata
what is the function of the xylem
transport water and mineral ions from the roots to the rest of the plant
2 adaptations of xylem
made of dead cells
no end wall between cells
what is the function of phloem
transport dissolved sugars from the leaves to the rest of the plant
what is the purpose of translocation
transport dissolved sugars from the leaves to other parts of the plant for respiration, growth and storage
what is the purpose of transpiration
provide water to keep the cells turgid
provide water to cells for photosynthesis
transport mineral ions to leaves
define the term transpiration
movement of water from the roots to the leaves through the xylem
name 4 factors that effect the rate of transpiration
temperature
light intensity
wind speed
humidity
what effect does temperature have on the rate of transpiration
high temperature increases the rate of transpiration
what effect does humidity have on on transpiration
high levels of humidity decrease the rate of transpiration
what effect does light intensity have on the rate of transpiration
stomata opens wider to let more carbon dioxide into the leaf for photosynthesis
what is the function of stomata
allow diffusion of gases into and out of the plant
where are most stomata found
underside of leaves
what is the advantage to the plant of having a high number of stomata at this location
reduces the amount of water loss through evaporation
