Q: Pacemaker cells stimulate the spontaneous contraction of cardiac muscle as a functional unit, called a what? Read this paragraph and choose the correct option from the provided answers: 10.7 Cardiac Muscle Tissue Cardiac muscle is striated muscle that is present only in the heart. Cardiac muscle fibers have a single nucleus, are branched, and joined to one another by intercalated discs that contain gap junctions for depolarization between cells and desmosomes to hold the fibers together when the heart contracts. Contraction in each cardiac muscle fiber is triggered by Ca++ ions in a similar manner as skeletal muscle, but here the Ca++ ions come from SR and through voltage-gated calcium channels in the sarcolemma. Pacemaker cells stimulate the spontaneous contraction of cardiac muscle as a functional unit, called a syncytium. Choices: - coenocyte - tapetum - adipocytes - syncytium A:
syncytium

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Q: What is the largest organelle in a eukaryotic cell? Read this paragraph and choose the correct option from the provided answers: The nucleus is the largest organelle in a eukaryotic cell. It contains most of the cell's DNA. DNA, in turn, contains the genetic code. This code "tells" the cell which proteins to make and when to make them. You can see a diagram of a cell nucleus in Figure below . Besides DNA, the nucleus contains a structure called a nucleolus. Its function is to form ribosomes. The membrane enclosing the nucleus is called the nuclear envelope. The envelope has tiny holes, or pores, in it. The pores allow substances to move into and out of the nucleus. Choices: - ribosome - vacuole - mitochondria - nucleus A:
(Answer)
nucleus

Ques: Q: The peripheral nervous system has major nerves that travel through every part of the body except which two places? Read this paragraph and choose the correct option from the provided answers: All the other nervous tissues in the body are part of the peripheral nervous system. If you look again at Figure above , you can see the major nerves of the peripheral nervous system. They include nerves that run through virtually every part of the body, both inside and out, except for the brain and spinal cord. Choices: - muscles and brain - lungs and spinal cord - brain and heart - brain and spinal cord A:
Ans: brain and spinal cord

(Q).
Q: What classification system was developed by a swedish botanist trying to classify all known living things? Read this paragraph and choose the correct option from the provided answers: All modern classification systems have their roots in the Linnaean classification system. It was developed by Swedish botanist Carolus Linnaeus in the 1700s. He tried to classify all living things that were known at his time. He grouped together organisms that shared obvious physical traits, such as number of legs or shape of leaves. For his contribution, Linnaeus is known as the "father of taxonomy. " You can learn more about Linnaeus and his system of classification by watching the video at this link: http://teachertube. com/viewVideo. php?video_id=169889 . Choices: - taxonomical system - plantological system - bionumerical system - linnaean system A:
(A).
linnaean system

Ques:Q: An atomic symbol is used to represent what? Read this paragraph and choose the correct option from the provided answers: Elements are represented by an atomic symbol. Choices: - electron shell - mole - weight - element A:

Ans:element

Q: Which hormone helps cells absorb sugar from the blood? Read this paragraph and choose the correct option from the provided answers: Endocrine system: A high concentration of sugar in the blood triggers secretion of insulin by an endocrine gland called the pancreas. Insulin is a hormone that helps cells absorb sugar from the blood. Choices: - estrogen - cortisol - adrenaline - insulin A:
insulin