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Pulmonary diffusion is the process by which a person moves air into and out of the lungs.

Choose the correct form of estar + the present participle of the verb in parentheses to compete the sentence. 4. Miguel y Elena ___________ (vivir) en un apartamento en la playa.

Antes de ir de vacaciones, hay que ________.

The oxyhemoglobin dissociation curve is a depiction of the relationship between partial pressure of oxygen and the degree of oxygen unloading from hemoglobin.

Choose the correct form of estar + the present participle of the verb in parentheses to compete the sentence. 5. El amigo de Antonio __________ (trabajar) en la oficina hoy.

¿Qué necesitas para viajar a otro país?

Choose the best answer that completes the sentence. La biblioteca está __________ los domingos por la noche.

ADH stimulates water retention at its target cells in the hypothalamus.

The target behavior is:

Heart rate decreases when the sympathetic nervous system sends impulses to the heart.