Notes on Neurotoxins, Hemotoxins, and Snake Anatomy

Neurotoxins

  • Definition: Neurotoxins interfere with the transmission of electrical impulses from nerves to muscles.
  • Functionality:
    • Electrical impulses travel from the brain to reach the heart, which is a muscle.
    • If the heart does not receive the signal to contract, it stops functioning.

Hemotoxins

  • Etymology: The prefix "Hemo-" refers to blood.
  • Impact: Hemotoxins affect blood components and can cause red blood cells to burst (lyse).
    • Normal function of red blood cells: Carry oxygen.
    • Result of hemotoxin action: If red blood cells are lysing, oxygen transport decreases, affecting overall physiology.

Snake Anatomy and Functionality

  • Jaw Structure:
    • Snake jaws can open and close significantly and allow profound movement in various directions.
    • Unlike human jaws, they have the ability to stretch and dislocate to swallow prey larger than their heads.
    • Bones in snake jaws do not fully disconnect, creating a flexible joint.

Types of Snakes and Feeding Mechanisms

  • Constriction:

    • Non-venomous snakes
    • Typically do not have fangs; instead, they use constriction to subdue prey.

  • Fangs:

    • Only venomous snakes possess fangs, which are retractable.
    • Importance of retractable fangs: Allows the snake to bite and inject venom without losing its fangs or ability to eat.

  • Biting Mechanics:

    • When striking to inject venom, a snake must release its grip immediately to prevent injury and ensure the fang remains available for future bites.
    • The concept of "dry bites": Snakes can bite without injecting venom, often seen when they feel threatened.

Identifying Venomous Snakes

  • Recognition:
    • Look for puncture wounds to identify snake bites from venomous species like rattlesnakes.
    • Always seek medical help after a snake bite; different antivenoms work for different snakes.
  • Location of Venomous Snakes in the U.S.:
    • Commonly found types: Rattlesnakes in Florida and Texas; potential presence in upstate New York (Adirondacks).

Post-Feeding Behavior of Snakes

  • Digestive Processes:
    • After consuming large prey, snakes may enter a state of reduced activity called a "food coma," where they conserve energy.
    • The digestion process takes time, and it is influenced by the size and type of meal consumed.
    • Snakes can go without food for extended periods post large meals, sustaining energy from nutrients during this time.