Pretend you are a teacher preparing a quiz for the text I will provide. 
            Each quiz question should follow the format below. 
            Ensure that you carefully recheck the questions and answers for accuracy. 
            The output should be a ready-to-use list of dictionaries for the Python eval function:

            [

                    "question": "WRITE THE QUESTION HERE",
                    "options": ["A) OPTION_1", "B) OPTION_2", "C) OPTION_3", "D) OPTION_4"],
                    "answer": INDEX_OF_CORRECT_ANSWER_IN_OPTIONS_LIST,
                    "explanation": "EXPLAIN WHY THE ANSWER IS CORRECT"

            ]

            Text:
            atrium of 
the heart. The two major veins that return deoxygenated blood to the 
right atrium from the upper and lower parts of the body, respectively.
Superior Vena Cava: Returns blood from the head, neck, arms, 
and chest.
Inferior Vena Cava: Returns blood from the lower body, including 
the legs, abdomen, and pelvis.
Functions of Systemic Circulation
1. Delivery of Oxygen and Nutrients
The most important function of systemic circulation is the delivery of 
oxygen from the lungs to tissues and organs, as well as the transport 
of nutrients from the digestive system to cells. Oxygen is carried by 
hemoglobin in red blood cells, and nutrients like glucose and amino 
acids are dissolved in plasma. These are transported via arteries, 
arterioles, and capillaries to cells throughout the body.
2. Removal of Metabolic Waste Products
Systemic circulation also facilitates the removal of metabolic waste 
products from tissues. Carbon dioxide, a byproduct of cellular 
respiration, is transported by veins to the lungs for exhalation. v
3.Temperature Regulation
The circulatory system plays a key role in regulating body temperature. 
Blood vessels near the skin surface can dilate (widen) to release heat 
when the body is warm, or constrict (narrow) to retain heat when the body 
is cold. This regulation is crucial for maintaining homeostasis.
4. Hormone Transport
The systemic circulation is responsible for transporting hormones released 
by various endocrine glands (such as the thyroid, adrenal glands, and 
pituitary). These hormones travel through the bloodstream to target 
organs and tissues, where they exert their effects.
Hemodynamics and Blood Pressure in Systemic Circulation
Hemodynamics refers to the dynamics of blood flow, including how blood pressure and blood flow
rate are regulated in the systemic circulation.
Blood Pressure
Blood pressure is the force exerted by the blood against the walls of blood vessels. It is highest in 
the aorta and gradually decreases as blood moves through the arteries, arterioles, capillaries, and 
veins.
Systolic Pressure: The higher number in a blood pressure reading, representing the pressure 
during the contraction of the heart (systole).
Diastolic Pressure: The lower number, representing the pressure when the heart is at rest
between beats (diastole).
Normal blood pressure is generally around 120/80 mmHg. Consistently high blood pressure
(hypertension) can strain the heart and blood vessels, while low blood pressure (hypotension) can
impair circulation and lead to organ damage.
Factors Affecting Blood Flow
Vascular Resistance: The resistance of blood vessels to blood 
flow, which is influenced by vessel diameter, length, and blood 
viscosity. Smaller vessels and increased viscosity increase 
resistance and decrease flow.
Cardiac Output: The amount of blood the heart pumps per
minute. It is determined by the heart rate and stroke volume.
Blood Volume: The total amount of blood in the circulatory 
system. Blood loss or

            Quiz: