What equipment do you need to check before a blood pressure measurement lab?

Before the blood pressure exercise, inspect all sphygmomanometer components including the tubing, cuff, manometer, and bulb for damage. Prepare alcohol swabs and stethoscopes at the front of the classroom. Ensure all equipment is undamaged and functional before students begin measurements to guarantee accurate results and safe handling.

How should you acclimate fish to a new tank environment?

Float the plastic bag containing fish in the 10-gallon tank for approximately 20 minutes to allow water temperatures to equalize. Then carefully open the bag, add some tank water, and gently pour the fish into the tank. Do not feed fish on their arrival day; begin feeding the next day with just a pinch of crushed food.

What steps prepare a fish tank before introducing goldfish?

Set up two 10-gallon tanks near a window and fill with 9 gallons of water. Add dechlorinator according to bottle directions and liquid beneficial bacteria per manufacturer instructions. Install and run the filter for one week before adding fish. This cycling period establishes beneficial bacteria, creating a healthy environment for the animals.

How do you maintain proper water conditions in a fish tank during the experiment?

Change 10 percent of the tank water daily, ensuring fresh water matches the tank temperature. Add fresh dechlorinator with each water change. Monitor water quality and temperature continuously. These practices maintain stable conditions necessary for accurate fish respiration measurements throughout the lab.

What temperature conditions should water baths reach for the fish respiration experiment?

Set up five water baths labeled with different temperature conditions one hour before class. Fill each halfway with aquarium water or dechlorinated tap water and adjust temperatures accordingly. Use dechlorinated ice cubes to cool water below 20-22°C if needed. Place a temperature probe in each bath to monitor accuracy.

Why is the one-week tank cycling period important before adding fish?

The one-week cycling period allows beneficial bacteria to establish in the tank, creating a healthy aquatic environment. This biological foundation removes harmful ammonia and nitrites produced by fish waste, stabilizing water chemistry. Without proper cycling, fish experience stress and poor water quality, compromising the reliability of respiration measurements.

What materials should be prepared for students during the fish respiration lab?

Prepare enough clear containers with screw caps for each pair of students to have two. Set up five water baths with temperature probes at the front of the classroom. Ensure all tanks are cycling properly and fish are acclimated before class begins. These materials enable students to measure fish respiration across different temperature conditions using the scientific method steps and applications procedure.

Physiology of the Circulatory System

Concepts Instructor Prep Student Protocol

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Physiology is a branch of biology that describes how organisms function and adapt to different environments. One of the most important organ systems that define an organism's physiology is the circulatory system, which transports blood, nutrients, oxygen, and hormones throughout the body. In humans, a measure of the circulatory system's function can be obtained by taking the blood pressure. The term blood pressure describes the lateral pressure produced by blood upon vessel walls.

One of the most important applications of blood pressure measurement is checking for increased blood pressure, a condition termed hypertension. One in every three adults in the United States suffers from hypertension, and it is one of the leading causes of cardiovascular disease. The equipment needed for a traditional indirect measurement of blood pressure includes a stethoscope and a sphygmomanometer. The sphygmomanometer consists of a blood pressure cuff containing a distensible bladder, and a rubber bulb with an adjustable valve which, when closed, helps in cuff inflation, and when open releases the built-up pressure. It also consists of tubing connecting the cuff to the bulb and to the manometer which displays the cuff's pressure in millimeters of mercury. In order to record the blood pressure reading the examiner wraps the cuff around the brachial artery, places a stethoscope over this artery, inflates the cuff above the expected systolic pressure, and then deflate it while auscultating and observing the manometer simultaneously. Initially, when the cuff is fully inflated, the artery is squeezed, and the blood flow is halted. Thus, there is no sound upon auscultation. Upon deflation, the first appearance of the Korotkoff sounds signifies the systolic pressure, which is audible due to the turbulent flow in the partially squeezed artery. Further deflation causes a continual decreasing cuff pressure, and the Korotkoff sounds remain audible throughout, up until the point where the cuff pressure is below the minimal arterial pressure. This reading denotes the diastolic pressure. The fraction of systolic over diastolic is recorded as the final blood pressure reading.

Another important indicator of human physiology is the respiration rate, the number of breaths per minute. The air we breathe in travels through our trachea, into our lungs through the bronchi. Inside the lungs it passes through the bronchioles to ultimately enter the specialized air sacs called alveoli. The alveoli are surrounded by blood capillaries which allow diffusion of inhaled oxygen into our bloodstream, and facilitate excretion of carbon dioxide, thus maintaining our system's homeostasis. For mammals like humans maintaining homeostasis includes preserving a relatively constant body temperature independent of the surrounding environmental temperature. This property makes us endotherms. Therefore, our metabolic rate and respiration rate stay relatively constant. On the contrary, nearly all fish, including goldfish, have an internal body temperature that almost matches the temperature of the environment surrounding them. Such organisms are called ectotherms. Since they don't actively maintain a constant internal temperature their metabolic and respiration rate changes to compensate for variation in surrounding environmental temperature. The respiration rate in fishes can be measured by counting the gill beats, the rise and fall of the operculum, or gill cover, per minute. There is one more factor that affects the respiration rate of aquatic organisms. Note, that a fish breathes in the dissolved oxygen present in its environment. And the amount of available dissolved oxygen in the water is dependent on the water's temperature. It decreases with increased temperature which also, in turn, affects the respiration rate.

In this lab you will examine the human circulatory system by measuring blood pressure under different conditions, and then study the effects of temperature on respiration using fish.

At the end of this lab, students should know...

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What is homeostasis?

The balanced internal state of organisms is known as homeostasis, which describes the processes by which organisms maintain their optimal internal conditions.

What is the link between physiology and homeostasis?

Physiology is the study of the normal functions and mechanisms of the different systems in the body. Humans and many other animals attain homeostasis through distinct physiological processes in specialized cells.

What are organ systems?

One or more cell types with supporting functions form tissues, which in turn make up organs with specialized bodily functions. Organ systems consist of two or more organs that work together to provide a common function. The vertebrate physiological system contains 11 major organ systems. While all of the organ systems are interconnected, they do function somewhat independently of one another.

What are the functions of the circulatory and respiratory systems?

The respiratory system controls gas exchange to supply the body with oxygen as it removes carbon dioxide in the lungs after passage through the nasal cavity, pharynx, larynx, trachea, and bronchus. The circulatory system consists of the heart, blood vessels and blood, and delivers oxygen and nutrients to the tissues, while removing carbon dioxide and waste products throughout the body.

What is blood pressure, why is it important to regulate its range?

Blood pressure is generated by the contraction of the heart ventricles. Elevated blood pressure levels over extended periods of time can strain and damage the blood vessels and is associated with cardiovascular disease and stroke.