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Objectives

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Organization in human body: The heart and circulatory system

The circulatory system is important because it's like the body's delivery system. Its main functions are:

The circulatory system

Introduction to Science

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Removing waste

Transporting oxygen and nutrients

Main functions of the circulatory system

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Main functions of the circulatory system

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Staying alive and healthy

Keeping body temperature stable

Main functions of the circulatory system

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The hearth

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Capillaries

Blood

Arteries

Blood Vessels

Veins

Circulatory system

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How it Works?

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-The heart beats about 100,000 times a day! -The circulatory system is about 60,000 miles long if you laid out all the blood vessels in a line—that's like circling the Earth two and a half times

Fun facts!

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Listen to the text and look at the picture:

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The human body is a system of many organ systems that work together. For example, the circulatory system works closely with the respiratory system. One of the respiratory system´s functions is to bring oxygen from the air into the body. Match each evidence statement to the claim that it supports.

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Multiple tissues work together in organs such as the heart. Multiple organs work together in organ systems. The hearth is part of an organ system called the circulatory system, which also includes the blood and the blood vessels. The blood and the smallest blood vessels are tissues. Larger blood vessels are organs.

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When many similar specialized cells are organized together, they form a system called a tissue. The ells in a tissue work together to allow the tissue to perform its function. In the heart, cardiomyocytes form cardiac muscle tissue. The function of this tissue is to expand and contract, or beat, forcefully. Because cardiomycytes are connected, they can send signals to one another. Match each evidence statement to the claim that it supports.

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6TH-ORGANIZATIONINHUMANBODY:THEHEARTANDCIRCULATORYSYSTEM-EN © 2023 by CASURID is licensed under CC BY-NC-ND 4.0

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- SC.6.L.14.1 Describe and identify patterns in the hierarchical organization of organisms from atoms to molecules and cells to tissues to organs to organ systems to organisms. - SC.6.L.14.2 Investigate and explain the components of the scientific theory of cells (cell theory): all organisms are composed of cells (single-celled or multi-cellular), all cells come from pre-existing cells, and cells are the basic unit of life. -SC.6.L.14.3 Recognize and explore how cells of all organisms undergo similar processes to maintain homeostasis, including extracting energy from food, getting rid of waste, and reproducing. -SC.6.L.14.4 Compare and contrast the structure and function of major organelles of plant and animal cells, including cell wall, cell membrane, nucleus, cytoplasm, chloroplasts, mitochondria, and vacuoles. -SC.6.L.14.5 Identify and investigate the general functions of the major systems of the human body (digestive, respiratory, circulatory, reproductive, excretory, immune, nervous, and musculoskeletal) and describe ways these systems interact with each other to maintain homeostasis. -SC.6.L.14.6 Compare and contrast types of infectious agents that may infect the human body, including viruses, bacteria, fungi, and parasite.

The Pump: Think of the heart as a powerful pump that keeps blood moving throughout your body. Chambers: The heart has four chambers: two atria (upper chambers) and two ventricles (lower chambers). Valves: Between each chamber, there are valves that act like doors, ensuring blood flows in the right direction and prevents backflow.