In the mammalian heart, the systemic and pulmonary circuits…

Plasma makes up approximately ____ percent of the total bloo…

The ____ are the initial branches of the trachea that lead i…

Kidneys regulate

Osmoconformers tend to live in environments with variable so…

Amphibians often use ____ as a respiratory surface.​

BONUS Your kidneys filter your blood about _____ times per d…

These are the only vertebrates in which blood flows directly…

Imagine that you have been assign the task of describing a n…

The percentage of whole blood occupied by red blood cells is…