A person with low thyroid hormone levels is found to have low TSH levels as well. What is the most likely cause?

A male experiences continuous sperm production throughout his adult life, while a female produces one mature egg per cycle. What explains this difference?

A person has chronically low blood calcium levels. Which hormone, acting in part on the kidneys, will help restore calcium balance?

Which pathway involves IP₃ as a second messenger and results in calcium release from the ER?

A patient has a damaged pancreas and struggles to digest fats and proteins. Which secretions are most likely reduced?

What best describes the relationship between the QRS complex and ventricular activity?

After a meal, which hormone promotes storage of nutrients through anabolic reactions?

According to the sliding filament model, what happens when a muscle fiber contracts?

Which hormone increases calcium levels in the blood by stimulating osteoclast activity?

Questions 5 – 10 are about the same study, in which a biologist collected data on a sample of 20 porcupines.  The 20 porcupines ranged in length from 33 cm to 60 cm, and had a mass of roughly 1300 grams to 8000 grams.    The biologist wanted to determine if a linear relationship existed between the length (in centimeters) of porcupines and their body mass (in grams).  After analyzing the data, she determined a linear relationship existed, and the regression equation was found to be: