membrane transport of large molecules

define endocytosis

Movement of large molecules into the cell (ingestion / uptake)

Define exocytosis

Movement of large molecules out of the cell (excretion / secretion)

what are the types of endocytosis

1. phagocytosis

2. pinocytosis

3. receptor - mediated

what is exocytosis used for

1. hormone secretion

2. neurotransmitter release

3. mucous secretion

what is a vesicle

Bubble-like, membranous sacs
• Made of a phospholipid bilayer containing fluid
• Transport bubble
• Protects substances being transported

what is phagocytosis also known as

cell eating

what is phagocytosis

Ingestion of large particles by specialised cells (phagocytes; in the immune system)

what is the process of phagocytosis used for

removing bacteria and debris

what is pinocytosis also known as

cell drinking

what is the function of pinocytosis

to take in extracellular fluid with dissolved substances

what molecules are moved by endocytosis

1. cholesterol

2. hormones

why is endocytosis selective

substances are found in small amounts

which substances are moved out of the cell by exocytosis

1. hormones

2. waste products

3. neurotransmitters

where are substances moved to in exocytosis

plasma membrane