Endochondral ossification begins with the formation of a(n)  

The shaft of a long bone is called the    

The most abundant mineral in the human body is     

The reaction N2 + 3 H2 → 2 NH3 is an example of a(n)    

Which of the following substances would be most acidic?    

Anatomy is to ________ as physiology is to ________.  

Carbohydrate molecules    

Glands that discharge an oily secretion into hair follicles are ________ glands.    

In negative feedback, the response of the system:  

The following are the main steps in the generation of an action potential. 1.   Sodium channels are inactivated. 2.   Voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization. 3.   Sodium channels regain their normal properties. 4.   A graded depolarization brings an area of an excitable membrane to threshold. 5.   A temporary hyperpolarization occurs. 6.   Sodium channel activation occurs. 7.   Sodium ions enter the cell and depolarization occurs. The proper sequence of these events is