Directions: Rewrite the sentences using the present perfect. Ivan lived in the U.S. for ten years. There was a lot of snow in Boston this month. 

Directions: Choose the correct answer from the drop-down menu to complete the sentence.  The weather has been very rainy two weeks. This is the rainiest April we’ve had 1999.

Directions: Fill in the simple past tense and past participle of each verb. Present Simple Past Past Participle run fly tear speak drink

After bicarbonate ions are produced in the erythrocyte, it moves into the plasma and is exchanged with  a _____ to keep electrical neutrality.

A new autoimmune drug has been developed that has a side effect of inhibiting the adaptive immune system.  Which of the following would the drug most likely affect?

In a healthy individual, which type of leukocyte accounts for the largest percentage in a sample of blood?

Cholecystokinin is released in response to __________ and results in ________.

In which area of the body would you expect to find MALT?

Directions: Fill in the simple past tense and past participle of each verb. Present Simple Past Past Participle write do give think hear

Select all correct answers. Why does the left ventricle have a thicker myocardial wall?