Download Body System Structures Function

Lesson 7
Biology
Engage: Brainstorming Body Systems
Record the structures and function of each body system in the table below.
Body
System
Structures
Function
Nervous
System
Circulatory
System
Excretory
System
Immune
System
Digestive
System
Respiratory
System
Skeletal
System
Muscular
System
Endocrine
System
Integumentary
System
Reproductive
System
Lymphatic
System
© 2013 Region 4 Education Service Center
STAAR™ Achievement Series for Science
Lesson 7
Biology
Explore: System Interactions and Running
Instructions: The reading passage below contains descriptions of running. Below each
paragraph, write the body system(s) that are involved.
Running
Running is a task that requires the interaction of many body systems working together.
Runners prepare for races by consuming large amounts pasta and potatoes. Pasta and
potatoes contain carbohydrates, which are the primary source of energy for muscles.
Carbohydrates are ultimately broken down into glucose. Glucose is absorbed through the
villi of the small intestine and diffuses into the bloodstream to be transported to muscle
cells.
As a runner begins to run a race, his or her respiration rate will increase. The runner
begins to breathe deeper and at a rapid rate. In addition, the heart beats more quickly.
This will result in more oxygen delivered to the muscle cells.
Running requires a great deal of coordination and is accomplished through the
contraction and relaxation of many muscle fibers. The brain sends a signal to the
muscles, stimulating them to contract or relax.
In response to the signal from the brain, the muscles contract and pull on the bones. The
actual interaction of the muscles pulling on the bones produces movement.
The muscle cells produce carbon dioxide. Carbon dioxide is a waste product. Carbon
dioxide is transported to the lungs by the blood. The lungs exchange gas and the waste
is removed when the runner exhales.
In addition to carbon dioxide, the cells of the body produce metabolic waste. The waste is
filtered from the blood by the kidneys and collected as urine. Urine is stored in the
bladder until it is released from the body.
While running, the runner’s body temperature increases. The regulation of body
temperature includes the production of sweat by the glands of the skin. Moisture on the
skin evaporates and produces a cooling effect. The interaction of all the body systems
helps to maintain homeostasis.
© 2013 Region 4 Education Service Center
STAAR™ Achievement Series for Science
Lesson 7
Biology
Explain: Body System Interactions
Animals must maintain balance between their internal and external environments. This
balance is maintained through the interaction of systems. Body systems interact to
perform the functions of regulation, nutrient absorption, reproduction, and defense from
injury or illness.
Nutrient absorption includes the passage of nutrients from the digestive system to the
bloodstream. Digestion occurs as food passes through a series of digestive organs and is
broken down into smaller molecules that can be absorbed and distributed to cells. The
blood stream transports molecules to the cells. The main organ systems that interact in
nutrient absorption are the digestive and circulatory systems.
Regulation is the process of body systems working together to maintain homeostasis
despite variation in external conditions. The nervous system and endocrine system help
detect and coordinate the response to changes in the environment. Negative feedback is
one example of regulation. If blood sugar gets too high, the hormone insulin is secreted.
In response, the liver removes glucose from the blood and stores it as glycogen.
Hormones are secreted by the endocrine system.
Responses to stimuli from the nervous system include the direct-connection pathways of
neurons. In the running example, the brain sent a message to muscles to contract. This
message was sent through neurons. A reflex arc is another example of regulation by the
nervous system. Reflexes include the detection of a stimulus such as a hot object by a
sensory neuron. The impulse travels down the sensory neuron to the spinal cord. In the
spinal cord, the impulse moves through an interneuron. The interneuron transmits the
impulse to the motor neuron, which then stimulates the muscles necessary to contract,
moving the appendage away from danger.
Reproduction includes gamete production, fertilization, and the development of offspring.
The main systems involved in reproduction are the reproductive system, endocrine
system, nervous system and circulatory system. The reproductive system includes the
reproductive organs such as testes, scrotum, penis, ovaries, fallopian tubes, uterus, and
vagina. The endocrine system releases hormones including testosterone, progesterone,
and estrogen that regulate the reproductive process. The circulatory system delivers
nutrients to the developing fetus and transports hormones.
Animals have many methods of defense against injury. The skin and skeleton provide
physical protection from injury. Reflexes also play a role in defense from injury. The skin
is part of the integumentary system, the skeleton is part of the skeletal system, and
reflexes are coordinated by the nervous system.
Animals have many methods of defense against illness. The immune system responds to
invaders by recognizing, attacking, and destroying the invaders. The immune system
includes the skin; secretions of mucus, tears, sweat, and saliva; and white blood cells.
The immune system works closely with other body systems, including the integumentary,
circulatory, and lymphatic systems.
© 2013 Region 4 Education Service Center
STAAR™ Achievement Series for Science
Lesson 7
Biology
Explain: Body System Interactions
Instructions: Read the passage provided. Locate the four main functions that systems
must interact to perform. Summarize the information in the boxes provided.
Summary:
Function:
System
interactions
include
Summary:
Function:
System
interactions
include
Summary:
Function:
System
interactions
include
Summary:
Function:
System
interactions
include
STAAR™ Achievement Series for Science
© 2013 Region 4 Education Service Center
Lesson 7
Biology
Elaborate: Describe the Interactions
Instructions: Read the scenario and describe the interactions that occur
among systems. Record your responses in your science notebook.
Response Scenario
Although it doesn’t happen often, it can snow in Texas. Kids rush outside to
play in the fresh snow and their body temperatures often drop. Humans have
an average body temperature of 37 ºC (98.6ºF). If the temperature increases
too much, proteins cannot function properly. If the temperature drops too
low, chemical reactions are slowed. Your body has many responses to
changes in temperature. The hypothalamus is responsible for regulating
temperature, sending out signals that start or stop heat production. One
response to a decrease in temperature is shivering. Shivering occurs when
muscles are signaled by neurons to contract.
A separate response occurs inside your cells. The hypothalamus receives
signals and releases a hormone that stimulates other glands to release
hormones, which ultimately target the thyroid gland. The thyroid gland
releases thyroxin into the bloodstream, and cells become more active,
resulting in an increased body temperature. When the temperature increases
to 37 ºC, nerve receptors send a signal to the hypothalamus to stop
releasing the hormone. Once this hormone is no longer released, the other
glands are turned off.
Fight or Flight Scenario
When a person feels frightened or threatened by something in their
environment, the stress response is initiated. Automatically, the nervous
system triggers the production of epinephrine from the adrenal gland.
Epinephrine circulates around your body to activate different responses.
Epinephrine stimulates the heart to beat faster and stronger. It also affects
the blood vessels that supply the digestive tract, directing blood away from
the digestive system. The blood will be circulated to muscles instead of the
digestive system, thus increasing survival chances. In the liver, epinephrine
stimulates the breakdown of glycogen into glucose. The glucose will provide
energy to responding cells. All of these activities increase the organism’s
chances of surviving a dangerous situation.
© 2013 Region 4 Education Service Center
STAAR™ Achievement Series for Science
Lesson 7
Biology
Name: _____________________________________________
Date: __________
Evaluate: Interactions of Animal Systems
1
2
During the process of nutrient absorption in animals, which two body systems are most
responsible for breaking down food into smaller pieces and distributing the nutrients to
body cells?
A
Endocrine system and immune system
B
Digestive system and circulatory system
C
Nervous system and digestive system
D
Muscular system and endocrine system
A young boy cuts his hand on a piece of glass. To prevent infection, white blood cells
travel to the site of the cut through the bloodstream. During this response to injury, the
circulatory system works with which body system?
F
Muscular system
G
Integumentary system
H
Excretory system
J
Immune system
STAAR™ Achievement Series for Science
© 2013 Region 4 Education Service Center
Lesson 7
Biology
3
4
In females, the hormone estrogen causes the lining of the uterus to thicken. Estrogen is
produced by the ovaries. When estrogen is produced, the reproductive system works with
which body system?
A
Endocrine system
B
Muscular system
C
Nervous system
D
Lymphatic system
Dialysis is a medical treatment used when a person’s kidneys are no longer able to
function. During this process, a machine uses an artificial membrane to remove waste
products from the blood. Which body system below is not functioning properly in a person
who requires dialysis?
F
Endocrine system
G
Immune system
H
Excretory system
J
Integumentary system
5 In humans, the gases oxygen and carbon dioxide must be exchanged between the
environment and cells. Explain the interactions of the circulatory system and
respiratory system involved in the process of gas exchange.
© 2013 Region 4 Education Service Center
STAAR™ Achievement Series for Science