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Questions and Answers
The heart of a frog has three chambers.
True
Which organ acts as the respiratory organ for gaseous exchange during aestivation and hibernation in a frog?
What is the pigment found in the red blood cells of a frog?
haemoglobin
Blood carries nutrients, gases, and water to their respective sites during ________.
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Match the following endocrine glands with their names:
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Study Notes
Frog Biology
- Respiration occurs through the buccal cavity, skin, and lungs on land.
- Pulmonary respiration involves the lungs, which are pink, sac-like structures in the thorax region.
- Air enters through the nostrils, then passes through the buccal cavity and into the lungs.
Vascular and Lymphatic Systems
- The vascular system is well-developed and closed, consisting of the heart, blood vessels, and blood.
- The heart is a muscular, three-chambered structure (two atria and one ventricle) located in the upper body cavity.
- The heart is covered by the pericardium and has a sinus venosus that receives blood from the vena cava.
- The ventricle opens into the conus arteriosus, which carries blood to the body through arteries.
- Veins collect blood from the body and form the venous system, with special connections between the liver and intestine (hepatic portal system) and kidneys and lower body (renal portal system).
Blood
- Blood consists of plasma and cells (RBCs, WBCs, and platelets).
- RBCs are nucleated, contain haemoglobin, and are responsible for carrying oxygen.
- Lymph lacks proteins and RBCs, but is similar to blood.
- Blood carries nutrients, gases, and water to their respective sites during circulation.
Excretory System
- The excretory system consists of kidneys, ureters, cloaca, and urinary bladder.
- Kidneys are compact, dark red, bean-like structures located in the body cavity.
- Each kidney has uriniferous tubules or nephrons that filter waste.
- Ureters emerge from the kidneys and open into the cloaca, which also receives waste from the urinary bladder.
- The frog excretes urea, making it a ureotelic animal.
Control and Coordination
- The system for control and coordination includes the neural system and endocrine glands.
- Hormones secreted by endocrine glands (e.g., pituitary, thyroid, parathyroid, thymus, pineal body, pancreatic islets, adrenals, and gonads) achieve chemical coordination of various organs.
- The nervous system is organized into a complex system that allows for coordinated responses.
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Description
Learn about the respiratory organs and systems of frogs, including the buccal cavity, skin, and lungs. Understand how air enters the body and how gaseous exchange occurs during different states.
