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Which nephrons have longer loops of Henle and are used mainly when highly concentrated urine is needed?

Which of the following statements regarding calcium homeostasis is true? 

ἠθέλησαν γὰρ αὐτοὶ ἰδεῖν τοὺς ἀνθρώπους τοὺς σωζομένους μετὰ τὸ ἀποκτανθῆναι τὸν ᾿Ιωάννην.

The type of chemoreceptor responsible for our sense of smell is called a(n) ________.

Killer T cells, which kill virus-invaded body cells, are also called ________.

Each hemoglobin molecule is able to transport ________ molecules of oxygen.

The brachial vein ________.

The brachial vein ________.

The sinoatrial node, located in the right atrium of the heart, is often called the ________.

Tunica ________, the middle layer of a typical blood vessel, contains smooth muscle and elastic fibers.