The Flow of Venous Return Is Kept to One Direction

question 90

Short Answer

The flow of venous return is kept to one direction only by the ____________________ in the veins.

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Definitions:

Grana

Stacks of thylakoids in the chloroplasts of plant cells, where photosynthesis takes place.

Autotrophs

Organisms capable of producing their own food from inorganic substances using light or chemical energy, such as plants and some bacteria.

Autotroph

Organisms that produce their own food from inorganic substances using light or chemical energy, such as plants and certain bacteria.

Raw Materials

The basic material from which a product is made, often referring to natural resources or primary agricultural products.