Answer the following question in one paragraph minimum:   What is your favorite artwork from the second half of the course and why?  

Kidneys secrete H+ in order to maintain blood pH. The secretion of H+ is linked to re-absorption of this ion:

The pressure difference between the two ends of a blood vessel is the driving force behind blood flow.

14. The ______ is the main pumping mechanism of the heart

Name structure “b” from the figure:

Name part “d” from the figure:

All mitochondria are found in the tail of the sperm cell.

Solve the problem.   A statue is 61-cm tall. When its shadow is 100 cm long, the shadow of a certain tree is 16 m long. How tall is the tree? Round to the nearest unit. (Give numerical value only in meters.)

The structure labeled with an “H” is permeable to:

Erection of the penis occurs when nitric oxide causest he testicular arteries to contract.