Give one function for the tissue at the pointer’s tip.

The goal of a positive feedback loop is to ________________________.

What is the correct path of urine flow through the urinary system?    

When body temperature rises, thermoreceptors sense this rise and send signals to the hypothalamus of the brain.  The hypothalamus activates sweat glands.  The sweat glands release sweat and body temperature falls through evaporative cooling.  In this scenario, what is the effector?

Fertilization typically occurs in the ______________.

What cell type deposits calcium in bone?

Hydrochloric acid is necessary in the stomach for the conversion of pepsinogen into its active protein-digesting form called ________.    

What is the contractile unit of skeletal muscle?

The two-way exchange of substances occurs in what vessels?

What is considered the pacemaker of the heart because it sets the pace of the cardiac cycle?