A cell with a membrane-bound nucleus is a/an ____________________
Fill in the blank(s) with correct word
eukaryote
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Blood enters into what structure in the heart from the superior and inferior vena cavae?
A. Right atrium B. Left ventricle C. Left atrium D. Right ventricle
Answer the following statements true (T) or false (F)
1. The functions of the nasal conchae are to enhance the air turbulence in the cavity and to increase the mucosal surface area exposed to the air. 2. The lungs are perfused by two circulations: the pulmonary and the bronchial. The pulmonary circulation is for oxygenation of blood. The bronchial circulation supplies blood to the lung structures (tissue). 3. Changes in arterial pH can modify respiration rate and rhythm even when carbon dioxide and oxygen levels are normal. 4. Intrapleural pressure is normally about 4 mm Hg less than the pressure in the alveoli. 5. During normal quiet breathing, approximately 500 ml of air moves into and out of the lungs with each breath.
What is the principal tissue of the tunica interna?
A. Loose areolar connective tissue B. Smooth muscle tissue C. Cardiac muscle tissue D. Simple squamous epithelium E. Stratified squamous epithelium
Sequential waves of smooth muscle contraction which propel food through the digestive tract are known as peristalsis.
a. true b. false