Animals in cold climates have typically have _____.

Approximately h ow many ganglion cells does the human eye have?

Age-related loss in muscle mass appears to begin around the age of _________.

ADH or vasopressin controls the retention of fluid, while aldosterone controls the retention of sodium.

A Z line is _____.

Alternative versions of a particular gene are known as _____.

Aldosterone signals the kidneys to _____.

A region of blindness in the visual field of patients with cortical damage is known as a(n) _____.

Each human eye contains around _____.

A growth cone for a developing neuron is _____.