GED Science : Circulatory and Respiratory Systems

Study concepts, example questions & explanations for GED Science

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Example Questions

Example Question #76 : Biology And Life Sciences

The heart, which is responsible for pumping oxygenated blood throughout the body, is a component of which system?

Possible Answers:

Respiratory system

Circulatory system

Digestive system

Lymphatic system

Correct answer:

Circulatory system

Explanation:

The circulatory system is responsible for transporting blood, oxygen, nutrients, and wastes throughout the body. The vessels of the circulatory system include arteries, arterioles, capillaries, venules, and veins. The heart is responsible for pumping the fluids of the circulatory system through these vessels, and is a major component of the circulatory system.

The respiratory system is responsible for transporting air to and from the lungs, and facilitates gas exchange with the capillaries of the circulatory system. The lymphatic system helps regulate fluid balance and immune system function; it consists of lymphatic vessels, the spleen, and the thymus. The digestive system breaks down and absorbs nutrients; it consists of the digestive tract from the mouth, through the stomach and small intestine, and to the rectum.

Example Question #92 : Ged Science

Which statement about the heart is true?

Possible Answers:

The heart is made of smooth muscle tissue

A healthy resting heart rate is around 120 beats per minute

The left side of the heart pumps faster than the right side of the heart

The heart can beat without being stimulated by nerves

Correct answer:

The heart can beat without being stimulated by nerves

Explanation:

The heart is able to pump independently of the brain thanks to a collection of cells that fire impulses automatically. These cells are located in the sinoatrial node, which leads to the node's nickname as the "pacemaker" of the heart. Even without stimulation by a nerve, the heart can continue beating.

The heart is made of cardiac muscle tissue; smooth muscle tissue lines internal organs and blood vessels. Both sides of the heart pump at the same rate, but the left side pumps with more force. Each side of the heart must pump the same volume, but the left side must pump it a greater distance since it pushes blood to the entire body. A normal resting heart rate is around 60-80 beats per minute. A heart rate of 120 would be more typical during exercise.

Example Question #1 : Circulatory And Respiratory Systems

Through which of the following structures does air flow?

Possible Answers:

Aorta

Urethra

Small intestine

Bronchus

Correct answer:

Bronchus

Explanation:

The respiratory system allows air to travel to the lungs. Air enters the mouth or nasal passages, travels through the trachea, and then into the bronchi. The bronchi split into smaller and smaller bronchioles before terminating in small sacs called alveoli.

The aorta is a major artery that carries blood away from the heart. The urethra carries urine from the bladder. The small intestine is a portion of the digestive tract that carries nutrients from the stomach to the large intestine.

Example Question #94 : Ged Science

What blood cells are responsible for protecting the body from pathogens and other foreign organisms?

Possible Answers:

Red blood cells

Platelets

White blood cells

Megakaryocytes

Correct answer:

White blood cells

Explanation:

Blood is composed of multiple cell types that have specific functions in the body. The red blood cells (erythrocytes) help carry oxygen to the tissues in the body. The white blood cells (leukocytes) help defend the body from bacteria and other illnesses. Platelets are cell fragments responsible for helping blood clot, and are created by megakaryocytes.

Example Question #2 : Circulatory And Respiratory Systems

Which heart chamber pumps blood to the body's tissues?

Possible Answers:

Right ventricle

Left atrium

Right atrium

Left ventricle

Correct answer:

Left ventricle

Explanation:

The heart has four chambers: two atria and two ventricles. The atria are responsible for receiving blood returning from the body, while the ventricles pump blood out of the heart. The right ventricle pumps blood to the lungs, while the left ventricle pumps blood to the rest of the body.

The flow of blood through the heart is: right atrium, right ventricle, lungs, left atrium, left ventricle, body.

Example Question #14 : Systems Biology

Which of the following statements is true about arteries?

Possible Answers:

They carry only deoxygenated blood

They allow nutrients to diffuse into the body tissues

They carry blood away from the heart

They only carry oxygenated blood

They return blood to the heart

Correct answer:

They carry blood away from the heart

Explanation:

Arteries are the high pressure blood vessels responsible for carrying blood away from the heart. All arteries in the body travel away from the heart toward other tissues.

Most arteries carry oxygenated blood, but the pulmonary arteries carry deoxygenated blood; these vessels are responsible for transporting deoxygenated blood from the right side of the heart to the lungs. Veins are responsible for returning blood back to the heart. Arteries do not allow for diffusion of nutrients; this process primarily occurs in capillaries.

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