Your overthinking bro. I don't know anything about psychology but I used to have the same sort of problem. Always try to think about positive things and they will natrually happen. Basiclly keep yourself in a good mood. Also stress might be causing your headache, try to root out the problem and solve it. Once again i am not a expert, just based on expeirnce.
Answer:
Arteries: These are elastic vessels that transport blood away from the heart. Pulmonary arteries carry blood from the heart to the lungs where oxygen is picked up by red blood cells. Systemic arteries deliver blood to the rest of the body.
Veins: These are also elastic vessels but they transport blood to the heart. The four types of veins are pulmonary, systemic, superficial, and deep veins.
Capillaries: These are extremely small vessels located within the tissues of the body that transport blood from the arteries to the veins. Fluid and gas exchange between capillaries and body tissues takes place at capillary beds.
Sinusoids: These narrow vessels are located within the liver, spleen, and bone marrow. Like capillaries, they deliver blood from larger arteries to veins. Unlike capillaries, sinusoids are permeable and leaky to allow for quick nutrient absorption.
Explanation:
Answer:
weaker
more
Explanation:
It more like it developed slower. That's also one of the reasons they live Longer if I remember correctly
Answer: D. Contractility of the heart muscle refers to the force of contraction that this muscle can exert.
Explanation:
The myocardial contractility is ability of the heart muscles to contract. This is achieved by the forces which develop between the contracting muscles caused by the filaments of actin and myosin.
The degree of binding of the muscle filaments dependents upon the calcium ion concentration. These actions are controlled in vivo by the sympathetic nervous system. It is driven by the release of the catecholamine, which is a process which determines the calcium ion concentration inside the cytosol of the muscles of the heart.
