The latch and unlatch instructions would be classified as: 
Definitions:
Vertebrate's Circulatory System
The closed circulatory system found in vertebrates, where the heart pumps blood through vessels to deliver nutrients and oxygen to cells.
Blood Vessels
Tubes in the body through which blood flows, including arteries, veins, and capillaries.
Hemolymph
The fluid that bathes the tissues in animals with an open circulatory system (e.g., arthropods and most mollusks).
Hemocoel
Blood cavity characteristic of animals with an open circulatory system.
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