The placenta facilitates nutrient absorption, gas exchange, and waste removal between the mother and the developing fetus.

Amphibians typically undergo external fertilization, where eggs are fertilized outside the female's body.

Gas exchange primarily occurs in the alveoli, which are tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged.

The average blood pressure in a healthy adult is typically around 120/80 mmHg.

The average daily production of saliva in a human is about 1 liter.

The average duration of human gestation is approximately 40 weeks.

The average heart rate of a healthy adult at rest is typically between 60 and 100 beats per minute.

The average length of a human newborn at birth is approximately 50 cm.

The average length of the human small intestine is approximately 5 meters.

The average lifespan of a red blood cell in humans is about 120 days.

The average lifespan of a red blood cell is about 120 days before it is recycled by the body.

The average minute ventilation for a resting adult is about 5-10 liters.

A healthy adult typically has 5 to 7 bowel movements per week.

An adult human typically has 32 teeth, including wisdom teeth.

The average respiratory rate for a resting adult is about 12-20 breaths per minute.

The average resting heart rate for adults is typically between 60-100 beats per minute.

The average tidal volume in a healthy adult human is approximately 500 mL.

It typically takes about 24 to 36 hours for food to travel through the entire digestive system.

Capillaries are small blood vessels that facilitate the exchange of nutrients and waste between blood and tissues.

Red blood cells transport oxygen from the lungs to the body's tissues and return carbon dioxide to the lungs.

The epiglottis prevents food and liquids from entering the trachea during swallowing, directing them to the esophagus.

The esophagus is a muscular tube that transports food from the mouth to the stomach.

The esophagus is a muscular tube that transports food from the mouth to the stomach.

The pancreas produces digestive enzymes and hormones, such as insulin, which regulate blood sugar levels.

The placenta serves multiple functions including nutrient and gas exchange, hormone production, and waste removal.

Heart valves prevent the backflow of blood, ensuring it flows in one direction through the heart chambers.

Valves in the heart prevent the backflow of blood, ensuring it flows in one direction.

A typical human female has two X chromosomes, denoted as XX.

The aorta is the largest artery in the human body, carrying oxygenated blood from the heart to the rest of the body.

The gallbladder stores bile produced by the liver until it is needed for digestion.