Biology Questions - 2894 Words

BIO 169 Ch. 20 S.G. Name: __________________________ Date: _____________ 1. The anatomical region found between the lungs that extends from the sternum to the vertebral column and from the first rib to the diaphragm. A) Epicardium B) Abdominal cavity C) Pericardium D) Mediastinum E) Thoracic cavity 2. The membrane that surrounds and protects the heart is called the A) pericardium. B) pleura. C) myocardium. D) mediastinum. E) endocardium. 3. The apex of the heart is normally pointed A) at the midline. B) to the left of the midline. C) to the right of the midline. D) is different for males and females E) posteriorly. 4. The outermost layer of the pericardium, which consists of inelastic dense irregular connective†¦show more content†¦Cardiac muscle fibers are electrically connected to neighboring fibers by A) desmosomes. B) tight junctions. C) gap junctions. D) interneurons. E) chordae tendinae. 22. Which of the following types of muscle contains the largest number of mitochondria per cell? A) Smooth muscle B) Skeletal muscle C) Cardiac muscle D) All the muscle types contain approximately the same number. E) Mitochondria are not found in muscle cells. 23. This is a network of specialized cardiac muscle fibers that provide a path for each cycle of cardiac excitation to progress through the heart. A) Systemic circuit B) Intercalated discs C) Cardiovascular center D) Cardiac conduction system E) Pulmonary circuit 24. Which of the following correctly lists the sequence of structures that a cardiac action potential follows in order to excite normal contraction of the heart? A) Bundle of His, Purkinje fibers, Atrioventricular (AV) node B) Sinoatrial (SA) node, Purkinje fibers, AV node, Bundle of His C) Purkinje fibers, AV node, SA node, Bundle of His D) SA node, AV node, Bundle of His, Purkinje fibers E) Bundle of His, SA node, AV node, Purkinje fibers Page 4 BIO 169 Ch. 20 S.G. 25. In comparison to skeletal muscle fibers, the contractile fibers of the heart are depolarized for ____ period of time. A) a shorter B) a longer C) the same 26. The volume of blood ejected from the leftShow MoreRelatedBiology: Key Questions Essay675 Words   |  3 Pagesï » ¿Biology Key Questions – Lesson #1 1. How many electrons does Mg2+ have? Answer: Mg2+ has 10 electrons. A Magnesium atom has 12 electrons, 2 of which are valence electrons. The atom will lose the 2 outermost electrons in order to stabilize its electron shell. The nucleus maintains its 12 protons and becomes a Mg2+ ion. 2. Given that the half-life of the radioisotope carbon-14 is 5730 years, how useful do you think this isotope would be for dating bones that are over a million yearsRead MoreEssay on Intro to Biology Questions1550 Words   |  7 Pagesstarvation, war, or epidemics? I do not believe there will be stabilization without a global catastrophe. 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Essay1071 Words   |  5 Pagesingrained into our world today whether we like it or not and while it may seem more prevalent and worse lately considering the advances in technology and the increase in hysteria over security, war is not a recent adjunct to society. That poses the question, where does war come from? As human beings, are we hard-wired biologically to fight each other or is it a behaviour influenced by peers and morals? What is war? According to the thefreedictionary.com online dictionary, war is described as: