Which of the following structures surrounds each spiracle?

Keep practicing — related questions

• Heart is surrounded by:
• The fluid filled sac that surrounds the heart is called the-
• For which of the following air enters the respiratory system through a series of external openings called s...
• The membrane covering of heart is _______.
• The structure covering the internal medulla of kidney is
• The outer covering of heart is known as the ______________.
• What is the protective sac around the heart called?
• These structures found inside of the heart prevent blood from flowing backwards.