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Unit 2: Body Systems, Genetics, Microorganisms, and Health
1. Body Systems
1.2 Circulatory System
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The heart is the central pumping organ of the
circulatory system
.
True
What is the function of the heart in the circulatory system?
Pumps blood
The heart propels blood through
blood vessels
.
True
Arteries carry blood away from the heart to deliver oxygen and
nutrients
Match the blood vessel with its characteristic:
Arteries ↔️ Thick, muscular walls
Veins ↔️ Thinner walls with valves
Capillaries ↔️ Dense network for exchange
Match the type of blood vessel with its function:
Arteries ↔️ Carry blood away from the heart
Veins ↔️ Carry blood towards the heart
Capillaries ↔️ Exchange substances with tissues
Capillaries facilitate the
exchange
of substances between blood and body tissues.
True
Blood contains cells and
plasma
Veins have
valves
to prevent backflow of blood.
True
Arteries carry blood
away
from the heart.
Veins have thicker walls than arteries.
False
Match the heart chamber with its function:
Right Atrium ↔️ Receives deoxygenated blood
Left Ventricle ↔️ Pumps oxygenated blood
Right Ventricle ↔️ Pumps blood to lungs
In systemic circulation, blood flows from the left ventricle to the body
tissues
.
The continuous circulation of blood through the heart and body ensures the efficient transport of essential
substances
What is the primary function of the circulatory system?
Transport substances
What does blood carry to cells in the body?
Oxygen and nutrients
Which type of blood vessel carries blood away from the heart?
Arteries
Order the functions of the circulatory system:
1️⃣ Transport oxygen to cells
2️⃣ Transport nutrients to cells
3️⃣ Transport hormones to regulate processes
4️⃣ Transport waste products away from cells
Arteries have thick, muscular walls to withstand high
pressure
from blood pumped by the heart.
What is the central organ of the circulatory system?
Heart
Arrange the blood vessels in order of blood flow away from the heart
1️⃣ Arteries
2️⃣ Capillaries
3️⃣ Veins
Capillaries maximize surface area for substance
exchange
with body tissues.
White blood cells provide
immune
defense against infection.
True
The circulatory system has two main pathways for blood circulation: pulmonary and
systemic
.
True
In the lungs, blood picks up oxygen and releases
carbon dioxide
.
True
In the body tissues, blood delivers oxygen and nutrients and collects waste
products
Veins carry blood towards the
heart
.
True
What are the three main components of the circulatory system?
Heart, blood vessels, blood
White blood cells defend against infection in the circulatory system.
True
Heart valves ensure blood flows in a
one-way
direction through the chambers.
Arrange the steps of pulmonary circulation in order:
1️⃣ Blood flows from right ventricle
2️⃣ Blood travels to lungs
3️⃣ Oxygen is absorbed, carbon dioxide released
4️⃣ Oxygenated blood returns to left atrium
Oxygenated blood returns to the left
atrium
Regular physical activity improves cardiovascular fitness.
True
Match the blood vessel type with its function:
Arteries ↔️ Carry blood away from the heart
Veins ↔️ Carry blood towards the heart
Capillaries ↔️ Facilitate substance exchange
Arteries carry blood away from the
heart
to deliver oxygen and nutrients.
True
Match the heart chamber with its function:
Right Atrium ↔️ Receives deoxygenated blood
Right Ventricle ↔️ Pumps blood to the lungs
Left Atrium ↔️ Receives oxygenated blood
Left Ventricle ↔️ Pumps blood to the body
What ensures the efficient circulation of essential substances throughout the body?
Blood vessels and heart
The heart acts as a pump to circulate blood throughout the body.
True
Where are red blood cells produced in the body?
Bone marrow
A healthy
circulatory system
is essential for overall well-being.
True
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