A skydiver's parachute fails to deploy. After some struggle, his reserve chute deploys in time to save his life. However, his landing is harder than normal, and he feels his knee slightly hyperextend. He shakes it off and goes about his normal routine. Later that day, he begins experiencing knee pain. Two days later, he notices that his knee "pops" when he crouches and soon discovers he has dislocated his femur on the knee. What muscle was likely injured initially?
A. Soleus
B. Popliteus
C. Sartorius
D. Quadriceps femoris
E. Tensor fasciae latae
Answer: B
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During fetal development, the vagina forms from the _________ sinus
Fill in the blank with correct word.
The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "C"?
A. contains digestive enzymes B. directs cellular activities, contains DNA C. outer boundary of cell, controls entry and exit of substances D. major site of ATP synthesis when oxygen is available E. site of protein synthesis
Simple goiter
A. is an enlargement of the thymus gland. B. is due to lack of iodine in the diet. C. is due to high levels of thyroxine in the blood. D. is described by all of these characteristics.
If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________
A) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle B) threshold is reached more quickly and heart rate would increase C) potassium channels compensate and no change in heart rate would occur D) heart rate would decrease, but blood pressure would rise due to the excess sodium present