Alveoli are tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged between the air and blood.

The alveoli are tiny air sacs in the lungs where gas exchange occurs, allowing oxygen to enter the blood and carbon dioxide to be expelled.

The alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs.

Endocrine glands are primarily responsible for the production and secretion of hormones in the human body.

The placenta facilitates the exchange of gases, nutrients, and waste between the mother and fetus.

The alveoli are tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs.

The testes are the male reproductive organs responsible for the production of sperm.

The testes are the male reproductive organs responsible for producing sperm.

The epiglottis is a flap that covers the trachea during swallowing to prevent food from entering the airway.

The aortic valve prevents the backflow of blood from the aorta into the left ventricle after contraction.

Amphibians are known for undergoing metamorphosis, transitioning from a larval stage to an adult form.

Arteries are the blood vessels that carry blood away from the heart.

Arteries carry oxygen-rich blood away from the heart to the tissues of the body.

The alveoli are lined with simple squamous epithelium, allowing for efficient gas exchange due to its thin structure.

Sexual reproduction involves the fusion of male and female gametes, leading to genetic diversity in offspring.

Most animals in the phylum Chordata exhibit bilateral symmetry, meaning their body can be divided into two mirror-image halves.

Vitamin K is primarily absorbed in the large intestine, where it is produced by gut bacteria.