Question

1. This is part of the heart that is under the simple squamous epithelium, fibroelastic connective tissue and some smooth muscles. This is where modified cardiac muscles are located.

2. These are structures made up of dense irregular connective tissue that acts as insulator for the flow of electric current across the heart, surrounds the cardiac valves, and where the ventricular and atrial muscles are inserted.

3. These are modified cardiac muscle that are pale staining, smaller with fewer myofibrils and intercalated discs than the regular cardiac muscle and located in the right atrial wall.

4. What tissue within the vascular wall which is the key in regulating blood pressure.  

5.This is a part of the blood vessel consisting of a single layer of squamous cells, loose connective tissue and sometimes few smooth muscle cells.

6. This is a collective term that refers to the capillaries, arterioles and venules in the outer part of the large blood vessels.

7. These are cells that surrounds the capillaries which contains dopamine, acetylcholine, and other neurotransmitters. It contains ion channels that responds to low oxygen and high carbon dioxide levels in the arterial blood.

8.These are blood vessels whose walls contains a single layer of squamous cells, 2 layers of smooth muscle cells, and an outer layer of thin connective tissue. It is the major determinant of the systemic blood pressure.

9.This is part of the circulatory system wherein the arterioles connect directly to venules. It is richly supplied by sympathetic and parasympathetic nerve fibers.

10. These are structures in the circulatory system that allows blood to flow into the capillary bed in a cyclical manner.     

Answer 1

1. Myocardium -
   1. Simple squamous epithelium, fibroelastic connective tissue is suggestive of the pericardium.
   2. The layer beneath the this layer is the myocardium. This is the layer which contains the cardiac muscle
   3. This layer also contains the specialized cells which form a part of the conduction system of the heart: sinoatrial node, internodal fibers, atrioventricular node, bundle of his and purkinje fibre.
2. Fibrous skeleton - it is a dense connective tissue that forms the fibrous skeleton of the heart. it performs all the functions mentioned in the question
3. SinoAtrial node - SA node is located in the right atrial and has less number of cytoskeletal elements in it compared to other atrial cells
4. Tunica media - this layer of blood vessel wall contain smooth muscle. They are under sympathetic and parasympathetic autonomous control. This controls the peripheral vascular resistance that influences the blood pressure
5. Tunica intima - this is the innermost layer of the blood vessel wall
6. Microcirculation
7. Carotid body glomus cell
8. Arteriole - these blood vessels are the major determinants of blood vessel
9. Arteriovenous anastomosis or vascular shunt
10. Precapillary sphincter - this is a band of smooth muscle around the origin of the capillary. In the case of hypoxia and accumulation of waste mater, the sphincter open.