To prevent [blank_start]backflow[blank_end], there are valves in both the heart and the [blank_start]veins[blank_end]. The [blank_start]arteries[blank_end] do not need valves, as the blood inside them flows at such a high [blank_start]pressure[blank_end], they do not need valves.
There are three types of valves in the heart: the tricuspid, [blank_start]bicuspid[blank_end] and semi-[blank_start]lunar[blank_end] valves.
On images and drawings of the [blank_start]heart[blank_end], the right and the left side are switched over. This is because you are looking at someone else's heart whilst they are [blank_start]facing[blank_end] you.
This is the cycle of blood from being oxidated at the lungs to returning there for reoxidation:
Lungs - gas [blank_start]exchange[blank_end].
02 blood to left atrium.
Through [blank_start]bicuspid[blank_end] valve to the ventricle.
Through semi lunar valve to the [blank_start]aorta[blank_end].
02 blood travels around the [blank_start]body[blank_end].
Looses oxygen to muscles through [blank_start]diffusion[blank_end].
De02 blood to the heart.
Through the [blank_start]vena cava[blank_end].
De02 blood to the right [blank_start]atrium[blank_end].
Through [blank_start]tricuspid[blank_end] valve into the right ventricle.
Through semi-lunar valve into the [blank_start]pulmonary artery[blank_end].
De02 blood to the lungs to be oxidated.
Tick all that describe the arteries.
Carry blood to the heart.
Carry blood away from the heart.
High pressure from the small lumen.
Tough, thick walls.
Muscles have strong, elastic fibres to make them strong.
Veins contain valves.
Capillaries are very [blank_start]small[blank_end]. They have thin, [blank_start]permeable[blank_end] walls that are [blank_start]one cell[blank_end] thick. This is all to speed up the process of [blank_start]diffusion[blank_end] and gas exchange.
Diffusion and [blank_start]osmosis[blank_end] are both the movement of particles from a [blank_start]high[blank_end] concentration to a [blank_start]low[blank_end] concentration. Osmosis only happens in the movement of [blank_start]water molecules[blank_end]. Both [blank_start]diffusion[blank_end] and osmosis can pass their particles through partially [blank_start]permeable[blank_end] membranes.
[blank_start]Active transport[blank_end], on the other hand, is the movement of particles from a low concentration to a high concentration. Active transport requires [blank_start]energy[blank_end]. Plants and certain cells like cells in the [blank_start]gut[blank_end] use active transport to obtain and [blank_start]absorb[blank_end] the [blank_start]nutrients[blank_end] they need. This is because there is often a higher concentration of nutrients [blank_start]inside[blank_end] the cell then [blank_start]outside[blank_end] it.
Tick all that apply about the red blood cells.
Triconcave shape for a larger surface area.
Biconcave shape for a larger surface area.
No nucleus to hold more oxygen.
Haemoglobin and oxygen react to make haemoglobin oxide.
Haemoglobin and oxygen react to make oxyhaemoglobin.
There are four components of blood: Plasma, red blood cells, white blood cells and...