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Academia - Collins Scientific Pocket Dictionaries - Biology
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pulmonary artery
Artère f pulmonaire

Pulmonary artery. See pulmonary vessels, heart, and circulatory system.


pulmonary vein
veine f pulmonaire

Pulmonary vein. See pulmonary vessels, heart, and circulation system.


pulmonary vessels
Vaisseauxmpl pulmonaires

Pulmonary vessels. blood vessels at
Mammals, due to their special functions, break the rule
In general, arteries carry oxygenated blood and veins carry deoxygenated blood. In fact, the pulmonary artery carries deoxygenated blood from the right ventricle to the lungs, while the pulmonary vein carries oxygenated blood from the lungs to the left atrium.
. See circulatory system and heart


pulse rate
With multiple impulsions

Pulse rate is a regular beating in the arteries resulting from the rhythmic movement of blood resulting from the heart beat. The pulse rate can be detected in the human body where the artery is close to the surface of the skin, such as at the wrist. The pulse rate of an adult human ranges between about 70 beats per minute during rest and more than 100 beats per minute during strenuous work or training.


punnet square
Get more génétique

Genetic table. A graphical method used in genetics to calculate the outcomes of all possible fertilizations, and thus the genotypes and phenotypes of the progeny. The symbols used to represent one parent's gametes genotype are written in the genetic table along the top horizontal line and that of the other parent along the vertical side. Possible permutations are extracted during fertilization by matching the male and female brides. See monohybrid inheritance
. incomplete dominance and backcross


pupa
chrysalide f. pope f

Virgin. Pupa. A stage in the life history of some insects between the larva and the adult imago during which a radical change in form occurs. See metamorphosis.


pyramid of numbers
Pyramid of numbers

Pyramid of numbers. A diagram showing the relationship between members of a food chain and showing that the members at the end of the chain are usually fewer in number—or, more precisely, have a smaller total mass (biomass).

The decrease results from a loss of energy at each link in the chain, meaning that each member of the food chain uses energy in different activities such as heat production and movement. The next members of the chain lose this energy, and as a result the lost energy can only suffice a smaller number of individuals.