The fight-or-flight response in humans is activated by epinephrine, a hormone secreted by the _____ glands.

Answers

Answer 1

Answer: The sympathetic nervous system reacts to a perceived threat and activates the fight or flight response. This activation releases epinephrine, a hormone secreted by the adrenal glands, especially the adrenal medulla.

Answer 2

Answer:

The correct answer would be adrenal gland.

Epinephrine or adrenaline is the enzyme secreted from medulla of the adrenal gland.

Epinephrine enzyme prepares a person for fight and flight situations.

It acts on sympathetic nervous system and increases the cardiac output of a person, blood flow towards the muscles, pupil dilation response, and blood glucose levels.

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A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40 V. What is the magnitude of the current flowing through the first device? A. 10 A B. 13.32 A C. 8 A D. 3.33 A

Answers

The answer is D. 3.33 A

In parallel connected devices, circuits are also placed parallel. It is known that in parallel circuits, total voltage is equal to the voltage of each device.

So, we know that:
Device 1 - R1 = 12 ohms
Device 2 - R2 = 4 ohms
Total voltage - V = 40V = V1 = V2

If V = I × R, for the first device is V1 = I1/R1.
⇒ I1 = V1 ÷ R1
⇒ I1 = 40 V ÷ 12 ohms
⇒ I1 = 3,33 A

Answer:

D. 3.33 A 100%

Explanation:

A mutation changes the DNA sequence AAGCCTGGCAAT to the new sequence AAGCCTGCGCAAT. What kind of mutation has occurred? A. deletion B. insertion C. duplication D. substitution

Answers

A mutation that changes the DNA sequence AAGCCTGGCAAT to the new sequence AAGCCTGCGCAAT is B. insertion. There are different types of mutations that can change DNA sequences. Insertions are mutations when one or more nucleotides are inserted. The original sequence has 12 nucleotides. The new sequence has 13 nucleotides because 1 nucleotide is inserted in between the 7th and the 8th nucleotide. Since the nucleotide is inserted, the mutation that occurred is insertion.

Answer:

Explanation:

Explain how a phagocyte destroys bacteria

Answers

basically they just take it into the cell by engulfing it. Once it is inside the cell it is broken down!

The right ventricle transports oxygenated blood to the lungs true or false

Answers

I believe the correct answer is FALSE.

Explanation:

The heart is an organ located at the center of the chest in the thoracic cavity and functions to supply blood to and from tissues giving the tissues oxygen and nutrients while taking away carbon dioxide and waste products. It is divided into 4 chambers and 2 chambers are separated by a muscular wall that prevents mixing of the blood.

Further Explanation:

Blood enters the heart via the vena cava which is divided into the superior vena cava that recieves blood from the upper region of the body that includes the head, neck and chest while the inferior vena cava recieves blood from the lower extremeties that includes the legs, the abdomen, the pelvic region and the thighs. The blood is deposited into the right atrium and is de-oxygenated. When it is deposited into the right atrium, the change in volume of the atrium and the expansion causes the valve to open and allow the de-oxygenated blood to flow into the right ventricle. The right ventricle then pumps the blood that is de-oxygenated to the lungs via the pulmonary artery which is the only artery that pumps de-oxygenated blood. In the lungs, carbon dioxide is removed and oxygen added to the blood and is taken to the left atrium which pumps the oxygenated blood to the left ventricle and then the left ventricle pumps the oxygenated blood to the rest of the body. The blood is then again taken through the body via the capillaries and the veins pick up the blood that has been removed of oxygen and added with carbon dioxide and transport the blood back to the heart via the vena cava. It enters the right atrium via both the inferior and superior vena cava and the de-oxygenated blood is circulated again to the lungs for oxygenation from the left ventricle.

Learn More:

Learn More about types of circulation: brainly.com/question/1615925

Learn more about the heart: brainly.com/question/12945500

Learn more about the circulatory system: brainly.com/question/919984

Level: High School

Subject: Biology

Topic: The Circulatory System

The statement “the right ventricle transports oxygenated blood to lungs” is false.

Further Explanation:

Heart of humans have four chamber namely right and left atrium also, right and left ventricle. The main purpose of heart is to pump blood throughout the body. Due to this constant beating of heart a pressure is maintained in the body which helps in the flow of the blood.

The heart receives the deoxygenated blood from the body parts. This blood reaches the right atrium by means of superior and inferior vena cava. The blood from right atrium is pushed to the right ventricle. So, the right ventricle always has deoxygenated blood. This blood is then pushed to the lungs by the means of pulmonary artery into the lungs.

This blood then gets oxygenated by the means of fusion through capillaries and returns back to the heart specifically, to the left side. This blood is then pumped to the organ systems where it provides the tissues with oxygen.

Important note-

a. The right side of the heart always has deoxygenated blood.

b. The left side of the heart has oxygenated blood.

Therefore, the statement that the right ventricle of the heart has oxygenated blood is not true.

Learn More-

1. Learn more about primary succession brainly.com/question/1386621

2. Learn more about energy storage brainly.com/question/523624

3. Learn more about transfer RNA brainly.com/question/236807

Answer Details:

Grade: Middle School

Subject: Biology

Chapter: Human Physiology

Keywords:

Heart, ventricle, atrium, right atrium, left atrium, right ventricle, left ventricle, oxygenated blood, deoxygenated blood, pulmonary artery, SA node, lungs, oxygenation of blood.

The outer and inner core of the Earth make up approximately one third of Earth’s mass True Or False

Answers

i think is false if i'm not mistaken only cause the mantle and the crust is larger then the outer and inner core

false because it always is

According to the big bang theory, the universe is continually getting

Answers

It theorizes that the universe is constantly expanded, in other words getting bigger.

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