Graded potentials occur along the axon of a neuron

Which of theses statements is true?

Which structure is visible at #10 below:  

Extra Credit Based on what you know about the relationship between joint stability and joint flexibility, which of these joint types is likely to be least stable?

You hear on the news of a terrible plane crash that happened where the only survivor had 3rd degree burns on 36% of their body.  Based on the rule of nines and the chart given below, which of these is possible:

Which is TRUE of endochondral ossification:

Explain why a person exercising outside on a hot day would often have a “flushed” or red appearance to their skin?

Which of these is true about negative feedback:

In which zone of the epiphyseal plate do chondrocytes enlarge?

A homeostatic system generally has three components: a receptor, an effector, and a control center.  In the example given below, determine which is acting as the effector: You have just started your morning run and your blood oxygen levels have become a little lower due to the increased metabolism of your muscle cells.  Decreased oxygen levels (as well as increased carbon dioxide levels) in the blood are detected by chemoreceptors.  In responding to this, the chemoreceptors communicate with the heart (to increase heart rate) and the blood vessels (to increase blood pressure).  Which is the effector?