Directions: Match each sentence with the correct explanation. The action: started in the past and continues into the present repeats during a period of time from past to present occurred at an indefinite time in the past   We have eaten at Gino’s three times so far this week. I have eaten pizza before. Maria has had her job for six years. So far, Alice has invited 15 people to her party. They have met my parents.

Older red blood cells may be removed and destroyed in the spleen.

Directions: Complete each sentence with the words in parentheses. Use the present perfect, the present perfect continuous, or the simple past of the verb. Use contractions when possible.   _____________ (I / read) that book three times.   _____________ (you / watch) TV all day long, or did you just put it on? My ____________ (sister / finish) her driving lessons. Now she’s ready to take her driving test. ___________ (I / shop) for furniture all week, but I still need a few things.  ____________(she / start) the new job yesterday.  __________ (she / have) several interviews with a lab researching global warming.

_________ contributes to the adaptive immune response through the production of antibodies.

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

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

A vasodilator applied to arterioles supplying a capillary bed would cause _______ in local blood flow to that tissue.

The ______________ are the last part of the electrical conducting system of the heart which stimulates the ventricular myocardium.

Bicarbonate rich pancreatic juices are needed to neutralize the acidic chyme from the stomach before intestinal digestion can begin.

The most numerous plasma proteins that have the greatest effect on osmotic pressure are