Q: The conductive cells within the heart establish the heart rate and transmit it through the what? Read this paragraph and choose the correct option from the provided answers: 19.2 Cardiac Muscle and Electrical Activity The heart is regulated by both neural and endocrine control, yet it is capable of initiating its own action potential followed by muscular contraction. The conductive cells within the heart establish the heart rate and transmit it through the myocardium. The contractile cells contract and propel the blood. The normal path of transmission for the conductive cells is the sinoatrial (SA) node, internodal pathways, atrioventricular (AV) node, atrioventricular (AV) bundle of His, bundle branches, and Purkinje fibers. The action potential for the conductive cells consists of a prepotential phase with a slow influx of Na+ followed by a rapid influx of Ca2+ and outflux of K+. Contractile cells have an action potential with an extended plateau phase that results in an extended refractory period to allow complete contraction for the heart to pump blood effectively. Recognizable points on the ECG include the P wave that corresponds to atrial depolarization, the QRS complex that corresponds to ventricular depolarization, and the T wave that corresponds to ventricular repolarization. Choices: - meiosis - conduction - neurons - myocardium A:
myocardium

Q: What is another word for seed plants? Read this paragraph and choose the correct option from the provided answers: The most basic division is between nonvascular plants and vascular plants . Vascular plants are further divided into those that reproduce without seeds and those that reproduce with seeds. Seed plants, in turn, are divided into those that produce seeds in cones and those that produce seeds in the ovaries of flowers. Seed plants are called gymnosperms . Seed plants called angiosperms produce seeds in the ovaries of flowers . Choices: - protosperm - phyla - echinoderm - gymnosperm A:
gymnosperm

Q: Q: What is the membrane that surrounds a fetus called? Read this paragraph and choose the correct option from the provided answers: The amniotic sac is a membrane that surrounds the fetus. It is filled with water and dissolved substances, known as amniotic fluid. Imagine placing a small plastic toy inside a balloon and then filling the balloon with water. The toy would be cushioned and protected by the water. It would also be able to move freely inside the balloon. The amniotic sac and its fluid are like a water-filled balloon. They cushion and protect the fetus. They also let the fetus move freely inside the uterus. Choices: - cell membrane - umbilicus - umbilical sac - amniotic sac A:
A: amniotic sac

Question: Q: What cells do lymphocytes originate from in the bone marrow? Read this paragraph and choose the correct option from the provided answers: Choices: - brain cells - kahp cells - calcium cells - stem cells A:
Answer: stem cells

*Question*
Q: What do you call any process in which excess water or wastes are removed from the body? Read this paragraph and choose the correct option from the provided answers: Excretion is any process in which excess water or wastes are removed from the body. Excretion is the job of the excretory system. Organs of excretion include the large intestine, liver, skin, lungs, and kidneys. Choices: - digestion - diffusion - depletion - excretion A:
**Answer**
excretion

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Q: Contour tillage helps slow water run-off and what process that causes topsoil loss? Read this paragraph and choose the correct option from the provided answers: Choices: - water erosion - ice shelf erosion - plate tectonics - soil erosion A:
(Answer)
soil erosion