Evolution of Crocodilians: Warm-Blooded Ancestors 1

What is the popular term for an ectothermic metabolism?

• Cold blooded

• Warm blooded

• Endothermic

• Mesothermic

Which animals generate their own body heat?

• Dinosaurs and crocodilians

• Birds and reptiles

• Crocodilians and reptiles

• Mammals and birds

What is the advantage of a four chambered heart for endothermic animals?

• Separation of oxygenated and deoxygenated blood

• Reduced oxygen consumption

• Low systemic blood pressure

• High pulmonary blood pressure

What is the purpose of the diaphragmaticus muscle in crocodilians?

• To regulate body temperature

• To mix oxygenated and deoxygenated blood

• To maintain a high systemic blood pressure

• To allow for breathing while running

What type of limb posture do most ectotherms have?

• Erect

• Upright

• Sprawling

• Semi-erect

What is the advantage of an upright limb posture for endotherms?

• Efficient respiratory system

• Reduced oxygen consumption

• Increased endurance

• Ability to run and breathe at the same time

What type of airflow do crocodilians and birds have?

• Unidirectional

• Intermittent

• Bidirectional

• Cyclic

What is the significance of the erect limbs in pseudosuchians?

• Suggests endothermic ancestry

• Indicates ectothermic metabolism

• Allows for high systemic blood pressure

• Enables long periods of activity

What can bone growth rate indicate about an animal's metabolism?

• Energy consumption

• Ability to hunt prey

• Resting metabolic rate

• Internal body temperature

What is the main reason why some pseudosuchians had to be somewhat endothermic?

• To pump blood vertically

• To achieve high systemic blood pressure

• To increase growth rate

• To survive in warm climates