Biology Questions

up the wall of the heart called the myocardium. Also like the skeletal muscles, the cardiac muscle

What is the name of the process by which cancer cells break off of tumors and spread to other parts of the body?

|(2 marks) | |c. |State two symptoms that may have led the veterinarian to suspect that George was suffering from a thyroid hormone |

The final 2 property points were earned for the description and discussion of specific heat.

B 2. B 3. B Part III: Challenge Yourself Groups and Puzzle 1. D 2. C Puzzle Hans Krebs, mitochondrion Herlihy:

1) The layer of the GI tract wall that is responsible for motility is the

Exercise 27 Activity 1 Surface Features of the Heart and Location (7 points total) Lab Activity 2

5. A. Fimbriae- hair like Gram-negative bacteria that allows attachment and through that the bacteria is able to colonize.

14. What do your heart block experiment results indicate about the spread of impulses from the atria to the ventricles?

The wave spreads through the atria before reaching the atrioventricular node, or AV node, located just above the right ventricle. The AV node focuses the wave into the ventricles, contracting the ventricles. Should the SA node fail, the AV node can take over as the primary pacemaker at a rate of forty to sixty beats per minute.

Another group of cells that act as a pacemaker for the heart is the sinoatrial node, which sends out action potentials that contract the ventricles and spreads to the atrioventricular node to lead to the contraction of the atrium. For the following lab, two techniques where utilized to examine the physiology of the heart an electrocardiograph and blood pressure test. The electrocardiograph was to test the heart rate and examine the depolarization and repolarization of the heart using the QRS complex. The blood pressure test was to see the differences in blood pressure in different scenarios based on the Korotkoff sounds. Overall, it is important to understand the general physiology of the heart, blood pressure, and electrocardiograph because it is a key component to being alive and if it does not function properly or efficiently if can result in

Identify the 12 leads of the ECG and describe which area of the heart each lead represents.

1. I think I did quite well on this test. I found that most of the multiple choice questions were very easy and obvious, however the written ones really made me think. The fact that this test was based in part on the labs we have done made it easy to connect the concepts on the test to experiments we have done (overall increase in understanding). The hardest question on the test by far was the one about the bride gaps in Winter. I vaguely remember talking about this one in class, but in my memory we only talked about the summer and thermal expansion, not the other way around (maybe we did, but I couldn't remember ). Apparently the answer was supposed to be that the bridge would crack because of thermal contraction, but that didn't really make any sense as I didn't know that the gaps had metal coverings on them.

Regular electrical impulses are sent within the conduction system of the heart prompting contraction (Marieb, 2015). These electrical signals can be identified and documented by the use of an electrocardiography (ECG) machine. In a familiar ECG recording, three waves will occur; The P wave, QRS complex and

The heart is located in the chest between the lungs behind the sternum and above the diaphragm. It is surrounded by the pericardium. Its size is about that of a fist, and its weight is about 250-300 g. Its center is located about 1.5 cm to the left of the midsagittal plane. Located above the heart are the great vessels: the superior and inferior vena cava, the pulmonary artery and vein, as well as the aorta. The aortic arch lies behind the heart. The esophagus and the spine lie further behind the heart.